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  <li class="isotopey">1</li>
  <li class="isotopey">2</li>
  <li class="isotopey">3</li>
  <li class="isotopey">4</li>
  <li class="isotopey">5</li>
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  <li class="isotopey">7</li>
  <li class="isotopey">8</li>
  <li class="isotopey">9</li>
  <li class="isotopey">10</li>
  <li class="isotopey">11</li>
  <li class="isotopey">12</li>
  <li class="isotopey">13</li>
  <li class="isotopey">14</li>
  <li class="isotopey">15</li>
  <li class="isotopey">16</li>
  <li class="isotopey">17</li>
  <li class="isotopey">18</li>
  <li class="isotopey">19</li>
  <li class="isotopey">20</li>
  <li class="isotopey">21</li>
  <li class="isotopey">22</li>
  <li class="isotopey">23</li>
  <li class="isotopey">24</li>  
              @import "compass/css3";

$charcoal: #6c6c6c;
ul {
  width: 1000px;
  border: 1px solid black;
  margin: 10px;
li {
  width: 100px;
  height: 100px;
  background: #ccc;
  margin: 5px; 
  padding-top: 40px;
  color: white;
  font-size: 25px;
  text-shadow: 0 0 5px $charcoal;
  box-sizing: border-box;
  text-align: center;
  transition: all 500ms ease;
  transition-property: transform, top, left;
  &.ui-sortable-placeholder {
    visibility: visible!important;
    background: #aaa;
    box-shadow: inset 0 0 100px $charcoal;
    &.active {
      box-shadow: inset 0 0 200px $charcoal;                
    &.starting {
      transition-property: none;
  &.grabbing {
    transform: rotate(3deg);            
  &.moving {
    box-shadow: $charcoal 0 0 5px 2px!important;
    transition: transform 200ms ease;    

/**** Isotope Filtering ****/

.isotope-item {
  z-index: 2;

.isotope-hidden.isotope-item {
  pointer-events: none;
  z-index: 1;
              var list = $('ul');
  transformsEnabled: false
  , itemSelector: '.isotopey'
  , onLayout: function() {
    list.css('overflow', 'visible');
  cursor: 'move'
  //, tolerance: 'intersection'  //'pointer' is too janky
  , start: function(event, ui) {                        
    //add grabbing and moving classes as user has begun
    //REMOVE isotopey so that isotope does not try to sort our item,
    //resulting in the item moving around and flickering on 'change'
    ui.item.addClass('grabbing moving').removeClass('isotopey');
      .addClass('starting') //adding the 'starting' class removes the transitions from the placeholder.
      //remove 'moving' class because if the user clicks on a tile they just moved,
      //the placeholder will have 'moving' class and it will mess with the transitions
      //put placeholder directly below tile. 'starting' class ensures the
      //placeholder simply appears and does not 'fly' into place
        top: ui.originalPosition.top
        , left: ui.originalPosition.left
    //reload the items in their current state to override any previous
    //sorting and to include placeholder, but do NOT call a re-layout
  , change: function(event, ui) {
    //change only fires when the DOM is changed. the DOM changes when 
    //the placeholder moves up or down in the document order 
    //within the sortable container
    //remove 'starting' class so that placeholder can now move smoothly
    //with the interface
    //reload items to include the placeholder's new position in the DOM. 
    //then when you sort, everything around the placeholder moves as 
    //though the item were moving it.
      .isotope({ sortBy: 'original-order'})
  , beforeStop: function(event, ui) {
    //in this event, you still have access to the placeholder. this means
    //you know exactly where in the DOM you're going to place your element.
    //place it right next to the placeholder. jQuery UI Sortable removes the
    //placeholder for you after this event, and actually if you try to remove
    //it in this step it will throw an error.
  , stop: function(event, ui) {      
    //user has chosen their location! remove the 'grabbing' class, but don't
    //kill the 'moving' class right away. because the 'moving' class is 
    //preventing your item from having transitions, you should keep it on
    //until isotope is done moving everything around. it will "snap" into place
    //right where your placeholder was.
    //also, you must add the 'isotopey' class back to the box so that isotope
    //will again include your item in its sorting list
    //reload the items again so that your item is included in the DOM order
    //for isotope to do its final sort, which actually won't move anything
    //but ensure that your item is in the right place
      .isotope({ sortBy: 'original-order' }, function(){
        //finally, after sorting is done, take the 'moving' class off.
        //doing it here ensures that your item "snaps" and isn't resorted
        //from its original position. since this happens on callback,
        //if the user grabbed the tile again before callback is fired,
        //don't remove the moving class in mid-grab
        //for some reason in this code pen, the callback isn't firing predictably
        if (!ui.item.is('.grabbing')) {
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