diff --git a/app/creature.js b/app/creature.js
index 14ef77b..7f13b81 100644
--- a/app/creature.js
+++ b/app/creature.js
@@ -123,6 +123,7 @@ var factory = (function () {
     } else return this.energy !== this.maxEnergy;
   };
 
+  baseCA.prototype.actionRadius = 1;
   baseCA.prototype.boundEnergy = function () {};
   baseCA.prototype.isDead = function () { return false; };
   baseCA.prototype.process = function (neighbors, x, y) {};
@@ -154,7 +155,7 @@ var factory = (function () {
           };
         }
 
-        var color = options.color;
+        var color = options.color || options.colour;
         // set the color randomly if none is provided
         if (typeof color !== 'object' || color.length !== 3) {
           options.color = [_.random(255), _.random(255), _.random(255)];
@@ -185,12 +186,14 @@ var factory = (function () {
            function () { init.call(this); } :
            function () {};
 
-        var color = options.color;
+        var color = options.color = options.color || options.colour;
         // set the color randomly if none is provided
         if (typeof color !== 'object' || color.length !== 3) {
           options.color = [_.random(255), _.random(255), _.random(255)];
         }
 
+        options.colorFn = options.colorFn || options.colourFn;
+
         types[type].prototype = new baseCA();
         types[type].prototype.constructor = types[type];
 
diff --git a/app/terrarium.js b/app/terrarium.js
index 923d06f..2a75513 100644
--- a/app/terrarium.js
+++ b/app/terrarium.js
@@ -16,9 +16,13 @@ var dom = require('./dom.js');
  *                                    "background" option is required if trails is set
  *   @param {array} background      an RGB triplet for the canvas' background
  */
-function Terrarium(width, height, options) {
+function Terrarium (width, height, options) {
+  var cellSize, neighborhood;
   options = options || {};
-  var cellSize = options.cellSize || 10;
+  cellSize = options.cellSize || 10;
+  neighborhood = options.neighborhood || options.neighbourhood;
+  if (typeof neighborhood === 'string') neighborhood = neighborhood.toLowerCase();
+
   this.width = width;
   this.height = height;
   this.cellSize = cellSize;
@@ -28,6 +32,7 @@ function Terrarium(width, height, options) {
   this.grid = [];
   this.nextFrame = false;
   this.hasChanged = false;
+  this.getNeighborCoords = _.getNeighborCoordsFn(width, height, neighborhood === 'vonneumann', options.periodic);
 }
 
 /**
@@ -110,7 +115,7 @@ Terrarium.prototype.step = function (steps) {
   function processCreaturesInner (creature, x, y) {
     if (creature) {
       var neighbors = _.map(
-        _.getNeighborCoords(x, y, gridWidth - 1, gridHeight - 1, creature.actionRadius),
+        self.getNeighborCoords(x, y, creature.actionRadius),
         zipCoordsWithNeighbors
       );
       var result = creature.process(neighbors, x, y);
diff --git a/app/util.js b/app/util.js
index 8ff3fe2..f6a713b 100644
--- a/app/util.js
+++ b/app/util.js
@@ -9,26 +9,105 @@ var _ = require('../lodash_custom/lodash.custom.min.js')._;
  * Takes a cell and returns the coordinates of its neighbors
  * @param  {int} x0     - x position of cell
  * @param  {int} y0     - y position of cell
- * @param  {int} xMax   - maximum x index i.e. grid width - 1
- * @param  {int} yMax   - maximum x index i.e. grid height - 1
+ * @param  {int} xMax   - maximum x index i.e. grid width
+ * @param  {int} yMax   - maximum x index i.e. grid height
  * @param  {int} radius - (default = 1) neighbor radius
  * @return {array}      - an array of [x, y] pairs of the neighboring cells
  */
-_.getNeighborCoords = function (x0, y0, xMax, yMax, radius) {
-  var coords = [], current, xLo, xHi, yLo, yHi;
-  if (typeof radius !== 'number' || radius < 1) radius = 1;
+_.getNeighborCoordsFn = function (xMax, yMax, vonNeumann, periodic) {
+  if (periodic) {
+    if (vonNeumann) {
+      // periodic von neumann
+      return function (x0, y0, radius) {
+        var coords = [], x, rX, y, rY, rYMax;
 
-  xLo = Math.max(0, x0 - radius);
-  yLo = Math.max(0, y0 - radius);
-  xHi = Math.min(x0 + radius, xMax);
-  yHi = Math.min(y0 + radius, yMax);
+        for (rX = -radius; rX <= radius; ++rX) {
+          rYMax = radius - Math.abs(rX);
+          for (rY = -rYMax; rY <= rYMax; ++rY) {
+            x = ((rX + x0) % xMax + xMax) % xMax;
+            y = ((rY + y0) % yMax + yMax) % yMax;
+            if (x !== x0 || y !== y0) {
+              coords.push({
+                x: x,
+                y: y
+              });
+            }
+          }
+        }
 
-  for (var x = xLo; x <= xHi; x++)
-    for (var y = yLo; y <= yHi; y++)
-      if (x !== x0 || y !== y0)
-        coords.push({ x: x, y: y });
+        return coords;
+      };
+    }
+    else {
+      // periodic moore
+      return function (x0, y0, radius) {
+        var coords = [], x, xLo, xHi, y, yLo, yHi;
 
-  return coords;
+        xLo = x0 - radius;
+        yLo = y0 - radius;
+        xHi = x0 + radius;
+        yHi = y0 + radius;
+
+        for (x = xLo; x <= xHi; ++x) {
+          for (y = yLo; y <= yHi; ++y) {
+            if (x !== x0 || y !== y0) {
+              coords.push({
+                x: (x % xMax + xMax) % xMax,
+                y: (y % yMax + yMax) % yMax
+              });
+            }
+          }
+        }
+
+        return coords;
+      };
+    }
+  } else {
+    // non-periodic, need to restrict to within [0, max)
+    xMax -= 1;
+    yMax -= 1;
+
+    if (vonNeumann) {
+      //non-periodic von-neumann
+      return function (x0, y0, radius) {
+        var coords = [], x, rX, y, rY, rYMax;
+
+        for (rX = -radius; rX <= radius; ++rX) {
+          rYMax = radius - Math.abs(rX);
+          for (rY = -rYMax; rY <= rYMax; ++rY) {
+            x = rX + x0;
+            y = rY + y0;
+            if (x >= 0 && y >=0 && x <= xMax && y <= yMax && (x !== x0 || y !== y0)) {
+              coords.push({
+                x: x,
+                y: y
+              });
+            }
+          }
+        }
+
+        return coords;
+      };
+    }
+    else {
+      // non-periodic moore
+      return function (x0, y0, radius) {
+        var coords = [], x, xLo, xHi, y, yLo, yHi;
+
+        xLo = Math.max(0, x0 - radius);
+        yLo = Math.max(0, y0 - radius);
+        xHi = Math.min(x0 + radius, xMax);
+        yHi = Math.min(y0 + radius, yMax);
+
+        for (x = xLo; x <= xHi; ++x)
+          for (y = yLo; y <= yHi; ++y)
+            if (x !== x0 || y !== y0)
+              coords.push({ x: x, y: y });
+
+        return coords;
+      };
+    }
+  }
 };
 
 _.pickRandomWeighted = function (weightedArrays) {
diff --git a/dist/terra.js b/dist/terra.js
index d5d5f68..763cc70 100755
--- a/dist/terra.js
+++ b/dist/terra.js
@@ -134,6 +134,7 @@ var factory = (function () {
     } else return this.energy !== this.maxEnergy;
   };
 
+  baseCA.prototype.actionRadius = 1;
   baseCA.prototype.boundEnergy = function () {};
   baseCA.prototype.isDead = function () { return false; };
   baseCA.prototype.process = function (neighbors, x, y) {};
@@ -165,7 +166,7 @@ var factory = (function () {
           };
         }
 
-        var color = options.color;
+        var color = options.color || options.colour;
         // set the color randomly if none is provided
         if (typeof color !== 'object' || color.length !== 3) {
           options.color = [_.random(255), _.random(255), _.random(255)];
@@ -196,12 +197,14 @@ var factory = (function () {
            function () { init.call(this); } :
            function () {};
 
-        var color = options.color;
+        var color = options.color = options.color || options.colour;
         // set the color randomly if none is provided
         if (typeof color !== 'object' || color.length !== 3) {
           options.color = [_.random(255), _.random(255), _.random(255)];
         }
 
+        options.colorFn = options.colorFn || options.colourFn;
+
         types[type].prototype = new baseCA();
         types[type].prototype.constructor = types[type];
 
@@ -317,9 +320,13 @@ var dom = require('./dom.js');
  *                                    "background" option is required if trails is set
  *   @param {array} background      an RGB triplet for the canvas' background
  */
-function Terrarium(width, height, options) {
+function Terrarium (width, height, options) {
+  var cellSize, neighborhood;
   options = options || {};
-  var cellSize = options.cellSize || 10;
+  cellSize = options.cellSize || 10;
+  neighborhood = options.neighborhood || options.neighbourhood;
+  if (typeof neighborhood === 'string') neighborhood = neighborhood.toLowerCase();
+
   this.width = width;
   this.height = height;
   this.cellSize = cellSize;
@@ -329,6 +336,7 @@ function Terrarium(width, height, options) {
   this.grid = [];
   this.nextFrame = false;
   this.hasChanged = false;
+  this.getNeighborCoords = _.getNeighborCoordsFn(width, height, neighborhood === 'vonneumann', options.periodic);
 }
 
 /**
@@ -411,7 +419,7 @@ Terrarium.prototype.step = function (steps) {
   function processCreaturesInner (creature, x, y) {
     if (creature) {
       var neighbors = _.map(
-        _.getNeighborCoords(x, y, gridWidth - 1, gridHeight - 1, creature.actionRadius),
+        self.getNeighborCoords(x, y, creature.actionRadius),
         zipCoordsWithNeighbors
       );
       var result = creature.process(neighbors, x, y);
@@ -553,26 +561,105 @@ var _ = require('../lodash_custom/lodash.custom.min.js')._;
  * Takes a cell and returns the coordinates of its neighbors
  * @param  {int} x0     - x position of cell
  * @param  {int} y0     - y position of cell
- * @param  {int} xMax   - maximum x index i.e. grid width - 1
- * @param  {int} yMax   - maximum x index i.e. grid height - 1
+ * @param  {int} xMax   - maximum x index i.e. grid width
+ * @param  {int} yMax   - maximum x index i.e. grid height
  * @param  {int} radius - (default = 1) neighbor radius
  * @return {array}      - an array of [x, y] pairs of the neighboring cells
  */
-_.getNeighborCoords = function (x0, y0, xMax, yMax, radius) {
-  var coords = [], current, xLo, xHi, yLo, yHi;
-  if (typeof radius !== 'number' || radius < 1) radius = 1;
+_.getNeighborCoordsFn = function (xMax, yMax, vonNeumann, periodic) {
+  if (periodic) {
+    if (vonNeumann) {
+      // periodic von neumann
+      return function (x0, y0, radius) {
+        var coords = [], x, rX, y, rY, rYMax;
 
-  xLo = Math.max(0, x0 - radius);
-  yLo = Math.max(0, y0 - radius);
-  xHi = Math.min(x0 + radius, xMax);
-  yHi = Math.min(y0 + radius, yMax);
+        for (rX = -radius; rX <= radius; ++rX) {
+          rYMax = radius - Math.abs(rX);
+          for (rY = -rYMax; rY <= rYMax; ++rY) {
+            x = ((rX + x0) % xMax + xMax) % xMax;
+            y = ((rY + y0) % yMax + yMax) % yMax;
+            if (x !== x0 || y !== y0) {
+              coords.push({
+                x: x,
+                y: y
+              });
+            }
+          }
+        }
 
-  for (var x = xLo; x <= xHi; x++)
-    for (var y = yLo; y <= yHi; y++)
-      if (x !== x0 || y !== y0)
-        coords.push({ x: x, y: y });
+        return coords;
+      };
+    }
+    else {
+      // periodic moore
+      return function (x0, y0, radius) {
+        var coords = [], x, xLo, xHi, y, yLo, yHi;
 
-  return coords;
+        xLo = x0 - radius;
+        yLo = y0 - radius;
+        xHi = x0 + radius;
+        yHi = y0 + radius;
+
+        for (x = xLo; x <= xHi; ++x) {
+          for (y = yLo; y <= yHi; ++y) {
+            if (x !== x0 || y !== y0) {
+              coords.push({
+                x: (x % xMax + xMax) % xMax,
+                y: (y % yMax + yMax) % yMax
+              });
+            }
+          }
+        }
+
+        return coords;
+      };
+    }
+  } else {
+    // non-periodic, need to restrict to within [0, max)
+    xMax -= 1;
+    yMax -= 1;
+
+    if (vonNeumann) {
+      //non-periodic von-neumann
+      return function (x0, y0, radius) {
+        var coords = [], x, rX, y, rY, rYMax;
+
+        for (rX = -radius; rX <= radius; ++rX) {
+          rYMax = radius - Math.abs(rX);
+          for (rY = -rYMax; rY <= rYMax; ++rY) {
+            x = rX + x0;
+            y = rY + y0;
+            if (x >= 0 && y >=0 && x <= xMax && y <= yMax && (x !== x0 || y !== y0)) {
+              coords.push({
+                x: x,
+                y: y
+              });
+            }
+          }
+        }
+
+        return coords;
+      };
+    }
+    else {
+      // non-periodic moore
+      return function (x0, y0, radius) {
+        var coords = [], x, xLo, xHi, y, yLo, yHi;
+
+        xLo = Math.max(0, x0 - radius);
+        yLo = Math.max(0, y0 - radius);
+        xHi = Math.min(x0 + radius, xMax);
+        yHi = Math.min(y0 + radius, yMax);
+
+        for (x = xLo; x <= xHi; ++x)
+          for (y = yLo; y <= yHi; ++y)
+            if (x !== x0 || y !== y0)
+              coords.push({ x: x, y: y });
+
+        return coords;
+      };
+    }
+  }
 };
 
 _.pickRandomWeighted = function (weightedArrays) {
diff --git a/dist/terra.min.js b/dist/terra.min.js
index 8d8e706..2346f2f 100755
--- a/dist/terra.min.js
+++ b/dist/terra.min.js
@@ -1 +1 @@
-!function(t){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{var e;"undefined"!=typeof window?e=window:"undefined"!=typeof global?e=global:"undefined"!=typeof self&&(e=self),e.terra=t()}}(function(){var t;return function e(t,n,r){function o(a,u){if(!n[a]){if(!t[a]){var c="function"==typeof require&&require;if(!u&&c)return c(a,!0);if(i)return i(a,!0);var f=new Error("Cannot find module '"+a+"'");throw f.code="MODULE_NOT_FOUND",f}var s=n[a]={exports:{}};t[a][0].call(s.exports,function(e){var n=t[a][1][e];return o(n?n:e)},s,s.exports,e,t,n,r)}return n[a].exports}for(var i="function"==typeof require&&require,a=0;a<r.length;a++)o(r[a]);return o}({1:[function(t,e){var n=t("./terrarium.js"),r=t("./creature.js");e.exports={Terrarium:n,registerCreature:r.registerCreature,registerCA:r.registerCA}},{"./creature.js":2,"./terrarium.js":5}],2:[function(t,e){var n=t("./util.js"),r=function(){function t(){this.age=-1}function e(){this.age=-1}t.prototype.initialEnergy=50,t.prototype.maxEnergy=100,t.prototype.efficiency=.7,t.prototype.size=50,t.prototype.actionRadius=1,t.prototype.sustainability=2,t.prototype.reproduceLv=.7,t.prototype.moveLv=0,t.prototype.boundEnergy=function(){this.energy>this.maxEnergy&&(this.energy=this.maxEnergy)},t.prototype.isDead=function(){return this.energy<=0},t.prototype.reproduce=function(t){var e=n.filter(t,function(t){return!t.creature});if(e.length){var o=e[n.random(e.length-1)],i=o.coords,a=r.make(this.type),u=function(){return this.energy-=this.initialEnergy,!0}.bind(this),c=this.wait;return{x:i.x,y:i.y,creature:a,successFn:u,failureFn:c}}return!1},t.prototype.move=function(t){var e=this,r=n.filter(t,function(t){return t.creature.size<this.size}.bind(this));if(r.length<this.sustainability&&(r=n.filter(t,function(t){return!t.creature})),r.length){var o=r[n.random(r.length-1)],i=o.coords,a=function(){var t=o.creature.energy*this.efficiency;return this.energy=this.energy+(t||-10),!1}.bind(this);return{x:i.x,y:i.y,creature:e,successFn:a}}return!1},t.prototype.wait=function(){return this.energy-=5,!0},t.prototype.process=function(t){var e={},n=this.maxEnergy;this.energy>n*this.reproduceLv&&this.reproduce?e=this.reproduce(t):this.energy>n*this.moveLv&&this.move&&(e=this.move(t));var r=e.creature;return r?(r.successFn=e.successFn||r.wait,r.failureFn=e.failureFn||r.wait,{x:e.x,y:e.y,creature:r,observed:!0}):this.energy!==this.maxEnergy},e.prototype.boundEnergy=function(){},e.prototype.isDead=function(){return!1},e.prototype.process=function(){},e.prototype.wait=function(){};var o={};return{make:function(t,e){var n=o[t];return n?new n(e):!1},registerCreature:function(e,r){var i=e.type;if("string"==typeof i&&"undefined"==typeof o[i]){o[i]="function"==typeof r?function(){this.energy=this.initialEnergy,r.call(this)}:function(){this.energy=this.initialEnergy};var a=e.color;return("object"!=typeof a||3!==a.length)&&(e.color=[n.random(255),n.random(255),n.random(255)]),o[i].prototype=new t,o[i].prototype.constructor=o[i],n.each(e,function(t,e){o[i].prototype[e]=t}),o[i].prototype.successFn=o[i].wait,o[i].prototype.failureFn=o[i].wait,o[i].prototype.energy=e.initialEnergy,!0}return!1},registerCA:function(t,r){var i=t.type;if("string"==typeof i&&"undefined"==typeof o[i]){o[i]="function"==typeof r?function(){r.call(this)}:function(){};var a=t.color;return("object"!=typeof a||3!==a.length)&&(t.color=[n.random(255),n.random(255),n.random(255)]),o[i].prototype=new e,o[i].prototype.constructor=o[i],n.each(t,function(t,e){o[i].prototype[e]=t}),!0}return!1}}}();e.exports=r},{"./util.js":6}],3:[function(t,e){var n=t("./util.js");e.exports=function(t,e,r,o,i){var a=t.getContext("2d");if(o&&i)a.fillStyle="rgba("+i+","+(1-o)+")",a.fillRect(0,0,t.width,t.height);else{if(o)throw"Background must also be set for trails";a.clearRect(0,0,t.width,t.height)}n.each(e,function(t,e){n.each(t,function(t,n){if(t){var o=t.colorFn?t.colorFn():t.color+","+t.energy/t.maxEnergy;a.fillStyle="rgba("+o+")",t.character?a.fillText(t.character,e*r,n*r+r):a.fillRect(e*r,n*r,r,r)}})})}},{"./util.js":6}],4:[function(t,e){var n=function(t,e,n,r,o,i){function a(o){var a=document.createElement("canvas"),u=a.getContext("2d");return o=function(){var t=document.createElement("canvas").getContext("2d"),e=window.devicePixelRatio||1,n=t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1;return e/n}(),a.width=t*o,a.height=e*o,a.style.width=t+"px",a.style.height=e+"px",u.setTransform(o,0,0,o,0,0),u.font="bold "+n+"px Arial",r&&(a.id=r),i&&(a.style.background="rgb("+i+")"),a}t*=n,e*=n;var u=a();return o?o.parentNode.insertBefore(u,o.nextSibling):document.body.appendChild(u),u};e.exports={createCanvasElement:n}},{}],5:[function(t,e){function n(t,e,n){n=n||{};var r=n.cellSize||10;this.width=t,this.height=e,this.cellSize=r,this.trails=n.trails,this.background=n.background,this.canvas=a.createCanvasElement(t,e,r,n.id,n.insertAfter,this.background),this.grid=[],this.nextFrame=!1,this.hasChanged=!1}var r=t("./util"),o=t("./creature.js"),i=t("./display.js"),a=t("./dom.js");n.prototype.makeGrid=function(t){for(var e=[],n=typeof t,r=0,i=this.width;i>r;r++){e.push([]);for(var a=0,u=this.height;u>a;a++)e[r].push(o.make("function"===n?t(r,a):"object"===n&&t.length?(t[a]||[])[r]:"string"===n?t:void 0))}return e},n.prototype.makeGridWithDistribution=function(t){for(var e=[],n=0,i=this.width;i>n;n++){e.push([]);for(var a=0,u=this.height;u>a;a++)e[n].push(o.make(r.pickRandomWeighted(t)))}return e},n.prototype.step=function(t){function e(t){if(t){var e=r.assign(new t.constructor,t),n=e&&e.isDead();return n&&!p.hasChanged&&(p.hasChanged=!0),e.age++,n?!1:e}return!1}function n(t){return r.map(t,e)}function o(t){return{coords:t,creature:g[t.x][t.y]}}function i(t){var e=t.creature;e?(e.failureFn(),e.boundEnergy()):(t.wait(),t.boundEnergy())}function a(t,e,n){if(t){var a=r.map(r.getNeighborCoords(e,n,h-1,y-1,t.actionRadius),o),u=t.process(a,e,n);if("object"==typeof u){var c=l[u.x],f=u.creature,s=u.y;c[s]||(c[s]=[]),c[s].push({x:e,y:n,creature:f}),!p.hasChanged&&f.observed&&(p.hasChanged=!0)}else u&&!p.hasChanged&&(p.hasChanged=!0),i(t)}}function u(t,e){r.each(t,function(t,n){a(t,e,n)})}function c(t,e,n){if(t){var o=t.splice(r.random(t.length-1),1)[0],a=o.creature;a.successFn()||(s[o.x][o.y]=!1),a.boundEnergy(),s[e][n]=a,r.each(t,i)}}function f(t,e){r.each(t,function(t,n){c(t,e,n)})}var s,l,p=this,h=this.width,y=this.height,g=this.grid;for("number"!=typeof 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