diff --git a/examples/cells-by-row.html b/examples/cells-by-row.html
new file mode 100644
index 0000000..0c12b39
--- /dev/null
+++ b/examples/cells-by-row.html
@@ -0,0 +1,214 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+
+  <title>masonry</title>
+
+  <link rel="stylesheet" href="examples.css" />
+  <style>
+    .element.alkali          { width: 170px; height: 120px; }
+    .element.alkaline-earth  {}
+    .element.lanthanoid      { height: 170px; }
+    .element.actinoid        { width: 170px; }
+    .element.transition      { height: 220px; }
+/*    .element.post-transition { background: #0FF; background: hsl( 180, 100%, 50%); }
+    .element.metalloid       { background: #08F; background: hsl( 216, 100%, 50%); }
+    .element.other.nonmetal  { background: #00F; background: hsl( 252, 100%, 50%); }
+    .element.halogen         { background: #F0F; background: hsl( 288, 100%, 50%); }
+    .element.noble-gas       { background: #F08; background: hsl( 324, 100%, 50%); }*/
+  </style>
+
+</head>
+<body>
+
+  <h1>sorting</h1>
+
+<div id="options">
+  <h2>Sort</h2>
+  <ul class="option-set">
+    <li><a href="#original-order">original-order</a></li>
+    <li><a href="#number">number</a></li>
+    <li><a href="#name">name</a></li>
+    <li><a href="#symbol">symbol</a></li>
+    <li><a href="#weight">weight</a></li>
+    <li><a href="#category">category</a></li>
+  </ul>
+</div>
+
+<div id="container">
+  
+  <div class="element transition metal   " data-symbol="Hg" data-category="transition">
+    <p class="number">80</p>
+    <h3 class="symbol">Hg</h3>
+    <h2 class="name">Mercury</h2>
+    <p class="weight">200.59</p>
+  </div>
+
+  <div class="element metalloid   " data-symbol="Te" data-category="metalloid">
+    <p class="number">52</p>
+    <h3 class="symbol">Te</h3>
+    <h2 class="name">Tellurium</h2>
+    <p class="weight">127.6</p>
+  </div>
+
+  <div class="element post-transition metal   " data-symbol="Bi" data-category="post-transition">
+    <p class="number">83</p>
+    <h3 class="symbol">Bi</h3>
+    <h2 class="name">Bismuth</h2>
+    <p class="weight">208.9804</p>
+  </div>
+
+  <div class="element transition metal   " data-symbol="Cd" data-category="transition">
+    <p class="number">48</p>
+    <h3 class="symbol">Cd</h3>
+    <h2 class="name">Cadmium</h2>
+    <p class="weight">112.411</p>
+  </div>
+
+  <div class="element alkaline-earth metal   " data-symbol="Ca" data-category="alkaline-earth">
+    <p class="number">20</p>
+    <h3 class="symbol">Ca</h3>
+    <h2 class="name">Calcium</h2>
+    <p class="weight">40.078</p>
+  </div>
+
+  <div class="element transition metal   " data-symbol="Re" data-category="transition">
+    <p class="number">75</p>
+    <h3 class="symbol">Re</h3>
+    <h2 class="name">Rhenium</h2>
+    <p class="weight">186.207</p>
+  </div>
+
+  <div class="element post-transition metal   " data-symbol="Tl" data-category="post-transition">
+    <p class="number">81</p>
+    <h3 class="symbol">Tl</h3>
+    <h2 class="name">Thallium</h2>
+    <p class="weight">204.3833</p>
+  </div>
+
+  <div class="element metalloid   " data-symbol="Sb" data-category="metalloid">
+    <p class="number">51</p>
+    <h3 class="symbol">Sb</h3>
+    <h2 class="name">Antimony</h2>
+    <p class="weight">121.76</p>
+  </div>
+
+  <div class="element transition metal   " data-symbol="Co" data-category="transition">
+    <p class="number">27</p>
+    <h3 class="symbol">Co</h3>
+    <h2 class="name">Cobalt</h2>
+    <p class="weight">58.933195</p>
+  </div>
+
+  <div class="element lanthanoid metal inner-transition   " data-symbol="Lu" data-category="lanthanoid">
+    <p class="number">71</p>
+    <h3 class="symbol">Lu</h3>
+    <h2 class="name">Lutetium</h2>
+    <p class="weight">174.9668</p>
+  </div>
+
+  <div class="element noble-gas nonmetal   " data-symbol="Ar" data-category="noble-gas">
+    <p class="number">18</p>
+    <h3 class="symbol">Ar</h3>
+    <h2 class="name">Argon</h2>
+    <p class="weight">39.948</p>
+  </div>
+
+  <div class="element alkali metal   " data-symbol="Rb" data-category="alkali">
+    <p class="number">37</p>
+    <h3 class="symbol">Rb</h3>
+    <h2 class="name">Rubidium</h2>
+    <p class="weight">85.4678</p>
+  </div>
+
+  <div class="element other nonmetal   " data-symbol="N" data-category="other">
+    <p class="number">7</p>
+    <h3 class="symbol">N</h3>
+    <h2 class="name">Nitrogen</h2>
+    <p class="weight">14.0067</p>
+  </div>
+
+  <div class="element actinoid metal inner-transition   " data-symbol="Np" data-category="actinoid">
+    <p class="number">93</p>
+    <h3 class="symbol">Np</h3>
+    <h2 class="name">Neptunium</h2>
+    <p class="weight">(237)</p>
+  </div>
+
+  <div class="element actinoid metal inner-transition   " data-symbol="Ac" data-category="actinoid">
+    <p class="number">89</p>
+    <h3 class="symbol">Ac</h3>
+    <h2 class="name">Actinium</h2>
+    <p class="weight">(227)</p>
+  </div>
+</div>
+
+<script src="../bower_components/eventEmitter/EventEmitter.js"></script>
+<script src="../bower_components/eventie/eventie.js"></script>
+<script src="../bower_components/doc-ready/doc-ready.js"></script>
+<script src="../bower_components/get-style-property/get-style-property.js"></script>
+<script src="../bower_components/get-size/get-size.js"></script>
+<script src="../bower_components/jquery-bridget/jquery.bridget.js"></script>
+<script src="../bower_components/matches-selector/matches-selector.js"></script>
+<script src="../bower_components/outlayer/item.js"></script>
+<script src="../bower_components/outlayer/outlayer.js"></script>
+<script src="../bower_components/masonry/masonry.js"></script>
+
+<script src="../item.js"></script>
+<script src="../layout-mode.js"></script>
+<script src="../isotope.js"></script>
+<script src="../layout-modes/fit-rows.js"></script>
+<script src="../layout-modes/cells-by-row.js"></script>
+
+<script>
+docReady( function() {
+  var container = document.querySelector('#container');
+  var iso = window.iso = new Isotope( container, {
+    // sortBy: 'symbol',
+    // filter: '.metal',
+    layoutMode: 'cellsByRow',
+    cellsByRow: {
+      columnWidth: 200,
+      rowHeight: 150
+    },
+    getSortData: {
+
+      number: '.number parseInt',
+      symbol: '.symbol',
+      name: '.name',
+      category: '[data-category]',
+
+      weight: function( itemElem ) {
+        // remove parenthesis
+        return parseFloat( getText( itemElem.querySelector('.weight') ).replace( /[\(\)]/g, '') );
+      }
+
+    }
+  });
+
+  var options = document.querySelector('#options');
+
+  eventie.bind( options, 'click', function( event ) {
+    if ( !matchesSelector( event.target, 'a' ) ) {
+      return;
+    }
+
+    // use link's href, remove leading hash
+    var sortBy = event.target.getAttribute('href').slice( 1 );
+    sortBy.slice( 0, 1 );
+    iso.options.sortBy = sortBy;
+    iso.layout();
+    event.preventDefault();
+  });
+
+});
+
+function getText( elem ) {
+  return elem.textContent || elem.innerText;
+}
+
+</script>
+
+</body>
+</html>
diff --git a/layout-mode.js b/layout-mode.js
index e1e3daa..2895fa8 100644
--- a/layout-mode.js
+++ b/layout-mode.js
@@ -4,8 +4,6 @@
 
 // --------------------------  -------------------------- //
 
-// var Isotope = window.Isotope;
-
 function layoutModeDefinition( Outlayer ) {
 
 var layoutMode = {};
@@ -13,6 +11,7 @@ var layoutMode = {};
 layoutMode.modes = {};
 
 layoutMode.create = function( namespace, options ) {
+  // layout mode class
   function LayoutMode( isotope ) {
     this.isotope = isotope;
     // link properties
diff --git a/layout-modes/cells-by-row.js b/layout-modes/cells-by-row.js
new file mode 100644
index 0000000..4d9ec9b
--- /dev/null
+++ b/layout-modes/cells-by-row.js
@@ -0,0 +1,81 @@
+( function( window ) {
+
+'use strict';
+
+function cellsByRowDefinition( layoutMode, getSize ) {
+
+  var CellsByRow = layoutMode.create( 'cellsByRow' );
+
+  var __resetLayout = CellsByRow.prototype._resetLayout;
+
+  CellsByRow.prototype._resetLayout = function() {
+    // call super
+    __resetLayout.call( this );
+    var containerSize = this.isotope.size;
+    this.itemIndex = 0;
+
+    this._getMeasurement( 'columnWidth', 'outerWidth' );
+    this._getMeasurement( 'rowHeight', 'outerHeight' );
+
+    var firstItem = this.items[0];
+    var firstItemSize = firstItem && firstItem.element && getSize( firstItem.element );
+
+    if ( !this.columnWidth ) {
+      // columnWidth fall back to item of first element
+      this.columnWidth = firstItemSize ? firstItemSize.outerWidth :
+        // or size of container
+        containerSize.innerWidth;
+    }
+
+    if ( !this.rowHeight ) {
+      // rowHeight fall back to item of first element
+      this.rowHeight = firstItemSize ? firstItemSize.outerHeight :
+        // or size of container
+        containerSize.innerHeight;
+    }
+
+    this.cols = Math.floor( containerSize.innerWidth / this.columnWidth );
+    this.cols = Math.max( this.cols, 1 );
+
+  };
+
+  CellsByRow.prototype._getItemLayoutPosition = function( item ) {
+    item.getSize();
+    var col = this.itemIndex % this.cols;
+    var row = Math.floor( this.itemIndex / this.cols );
+    // center item within cell
+    var x = ( col + 0.5 ) * this.columnWidth - item.size.outerWidth / 2;
+    var y = ( row + 0.5 ) * this.rowHeight - item.size.outerHeight / 2;
+    this.itemIndex++;
+    return { x: x, y: y };
+  };
+
+  CellsByRow.prototype._getContainerSize = function() {
+    return {
+      height: ( this.itemIndex / this.cols ) * this.rowHeight
+    };
+  };
+
+  return CellsByRow;
+
+}
+
+if ( typeof define === 'function' && define.amd ) {
+  // AMD
+  define( [
+      '../layout-mode',
+      'get-size/get-size'
+    ],
+    cellsByRowDefinition );
+} else {
+  // browser global
+  cellsByRowDefinition(
+    window.Isotope.layoutMode,
+    window.getSize
+  );
+}
+
+
+})( window );
+
+
