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HTML 

              
                <button id="toggle">Toggle</button>

<div class="clock ticking">
  <div class="bigcog">
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">1</p></div>
        <div class="face back"><p class="text">10</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">7</p></div>
        <div class="face back"><p class="text">4</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">5</p></div>
        <div class="face back"><p class="text">8</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">11</p></div>
        <div class="face back"><p class="text">2</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">3</p></div>
        <div class="face back"><p class="text">12</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">9</p></div>
        <div class="face back"><p class="text">6</p></div>
      </div>
    </div>
  </div>
  <div class="bigcog">
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">1</p></div>
        <div class="face back"><p class="text">10</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">7</p></div>
        <div class="face back"><p class="text">4</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">5</p></div>
        <div class="face back"><p class="text">8</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">11</p></div>
        <div class="face back"><p class="text">2</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">3</p></div>
        <div class="face back"><p class="text">12</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">9</p></div>
        <div class="face back"><p class="text">6</p></div>
      </div>
    </div>
  </div>
  <div class="bigcog">
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">1</p></div>
        <div class="face back"><p class="text">10</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">7</p></div>
        <div class="face back"><p class="text">4</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">5</p></div>
        <div class="face back"><p class="text">8</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">11</p></div>
        <div class="face back"><p class="text">2</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">3</p></div>
        <div class="face back"><p class="text">12</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">9</p></div>
        <div class="face back"><p class="text">6</p></div>
      </div>
    </div>
  </div>
  <div class="bigcog">
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">1</p></div>
        <div class="face back"><p class="text">10</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">7</p></div>
        <div class="face back"><p class="text">4</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">5</p></div>
        <div class="face back"><p class="text">8</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">11</p></div>
        <div class="face back"><p class="text">2</p></div>
      </div>
    </div>
    <div class="smallcog">
      <div class="head">
        <div class="face front"><p class="text">3</p></div>
        <div class="face back"><p class="text">12</p></div>
      </div>
      <div class="head">
        <div class="face front"><p class="text">9</p></div>
        <div class="face back"><p class="text">6</p></div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  background-color: #3c404b;
}

/* Move the button out of the way */
button {
  position: fixed;
  top: 1em;
  right: 1em;
  padding: 1em;
}

/* The main container */
.clock {
  position: relative;
  width: 40em;
  height: 40em;
  margin: 2em auto;
  background-color: rgb(46, 49, 58);
  border-radius: 50%;
  border: 1em solid #2C2F38;
  box-shadow: 0 0 1em #181818;
  
  /* Can't remember what this does */
  transform-style: preserve-3d;
  
}

/* Initial clock styles (Showing 1's) */

.clock .bigcog {
  position: absolute;
  width: 40%;
  height: 40%;
  background-color: #282B33;
  border-radius: 50%;
  box-shadow: 0 0 1em #1F1E1E;
}

.clock .bigcog:nth-child(1) { right: 51%; bottom: 51%; }
.clock .bigcog:nth-child(2) { left: 51%; bottom: 51%; }
.clock .bigcog:nth-child(3) { top: 51%; right: 51%; }
.clock .bigcog:nth-child(4) { left: 51%; top: 51%; }

.clock .smallcog {
  position: absolute;
  width: 58%;
  height: 58%;
  background-color: #23252C;
  border-radius: 50%;
  box-shadow: 0 0 1em #161616;
}

.clock .smallcog { transform-origin: 100% 100%; right: 50%; bottom: 50%; }

.clock .head {
  position: absolute;
  width: 40%;
  height: 40%;
}

.clock .head { transform-origin: 100% 100%; right: 50%; bottom: 50%; }

.clock .face {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: black;
  color: white;
  border-radius: 75% 25% 0% 25%;
  border-style: solid;
  border-color: white;
  border-width: 0.1em 0 0 0.1em;
  backface-visibility: hidden;
  overflow: hidden;
  background-color: #15171B;
  box-shadow: 0 0 1em #1A1A1A;
}

.clock .text {
  display: block;
  position: absolute;
  bottom: -100%;
  right: -100%;
  width: 200%;
  height: 200%;
  padding: 0;
  margin: 0;
  line-height: 1.2;
  font-weight: 900;
  font-size: 600%;
  text-align: center;
}

/* Initial part rotations (For showing 1's) */

/* Rotation animation rule is 
    if the end is greater than the start, it'll rotate clockwise; 
    if the end is less than the start, it's counterclockwise. 
    http://stackoverflow.com/questions/10473080/how-to-control-css3-animation-rotate-direction#comment13530782_10473150 */

/* We want clockwise so end needs to be greater than start */

/* The heads are rotated -2520 and -2700 so that we can run a keyframe animation 
  for several rotations and keep the heads spinning clockwise (See rule above) */
.clock .head:nth-child(1) { transform: rotateZ(-2520deg); }
.clock .head:nth-child(2) { transform: rotateZ(-2700deg); }

/* The faces are back to back (only 1 visible at a time) */
.clock .face.front { transform: rotateZ(180deg) rotateY(0deg); }
.clock .face.back { transform: rotateZ(180deg) rotateY(-180deg); }

/* Rotate the smallcogs so that the smallcog that has 1 in it is in the center of the clock.
  Could just rotate the bigcogs here but that makes animation far more complicated 
  (transforms need to be complete, any that aren't specified are lost, which makes animation of just 1 transform property tricky
  so we would need 4x the number of animations to retain each bigcog's rotateZ)  */
.clock .bigcog:nth-child(1) .smallcog:nth-child(1) { transform: rotateZ(180deg); }
.clock .bigcog:nth-child(1) .smallcog:nth-child(2) { transform: rotateZ(60deg); }
.clock .bigcog:nth-child(1) .smallcog:nth-child(3) { transform: rotateZ(300deg); }
.clock .bigcog:nth-child(2) .smallcog:nth-child(1) { transform: rotateZ(270deg); }
.clock .bigcog:nth-child(2) .smallcog:nth-child(2) { transform: rotateZ(150deg); }
.clock .bigcog:nth-child(2) .smallcog:nth-child(3) { transform: rotateZ(30deg); }
.clock .bigcog:nth-child(3) .smallcog:nth-child(1) { transform: rotateZ(90deg); }
.clock .bigcog:nth-child(3) .smallcog:nth-child(2) { transform: rotateZ(330deg); }
.clock .bigcog:nth-child(3) .smallcog:nth-child(3) { transform: rotateZ(210deg); }
.clock .bigcog:nth-child(4) .smallcog:nth-child(1) { transform: rotateZ(0deg); }
.clock .bigcog:nth-child(4) .smallcog:nth-child(2) { transform: rotateZ(240deg); }
.clock .bigcog:nth-child(4) .smallcog:nth-child(3) { transform: rotateZ(120deg); }

/* Position the text on the faces so that whichever text is in the center position is the right way up */
.clock .bigcog:nth-child(1) .text { transform: rotateZ(0deg); }
.clock .bigcog:nth-child(2) .text { transform: rotateZ(270deg); }
.clock .bigcog:nth-child(3) .text { transform: rotateZ(90deg); }
.clock .bigcog:nth-child(4) .text { transform: rotateZ(180deg); }

/* Ticking Animation */

/* Rotate the bigcogs to give the impression the smallcogs are rotating */
.clock.ticking .bigcog { animation: rotate-1turn-3steps 3s linear infinite; }

/* Flip from one face to another. They have to use seperate animations because one starts 
  at 0deg and one at -180deg and animations must be absolute - not relative */
.clock.ticking .face.front { animation: flip-1turn-2steps 2s linear infinite; }
.clock.ticking .face.back { animation: flip-1turn-2steps-alt 2s linear infinite; }

/* Rotate the head. In order to make this work we need to use keyframes to complete 5 180deg rotations, 
  a full 360deg rotation, 5 more 180deg rotations and another full 360deg rotation to bring us back to the start.
  The interspersed full rotations allow all 12 values to be display and then go back to 1. 
  The relative vs absolute thing applies here too. */
.clock.ticking .head:nth-child(1) { animation: rotate-5half-1full-x2 12s linear infinite; }
.clock.ticking .head:nth-child(2) { animation: rotate-5half-1full-x2-alt 12s linear infinite; }

/* The keyframe definitions */

/* Full turn with 2 pauses starting at 0 */
@keyframes rotate-1turn-3steps { 
  from { transform: rotateZ(0deg); } 
  16.666% { transform: rotateZ(120deg); }
  33.333% { transform: rotateZ(120deg); }
  50% { transform: rotateZ(240deg); }
  66.666% { transform: rotateZ(240deg); }
  83.333% { transform: rotateZ(360deg); }
  to { transform: rotateZ(360deg); } 
}

/* Flip halfway, pause, finish flip. Starting at 0 */
@keyframes flip-1turn-2steps { 
  from { transform: rotateZ(180deg) rotateY(0deg); }  
  25% { transform: rotateZ(180deg) rotateY(180deg); }
  50% { transform: rotateZ(180deg) rotateY(180deg); }
  75% { transform: rotateZ(180deg) rotateY(360deg); }
  to { transform: rotateZ(180deg) rotateY(360deg); } 
}

/* Flip halfway, pause, finish flip. Starting at -180 */
@keyframes flip-1turn-2steps-alt { 
  from { transform: rotateZ(180deg) rotateY(-180deg); } 
  25% { transform: rotateZ(180deg) rotateY(0deg); }
  50% { transform: rotateZ(180deg) rotateY(0deg); }
  75% { transform: rotateZ(180deg) rotateY(180deg); }
  to { transform: rotateZ(180deg) rotateY(180deg); } 
}

/* 5 half rotations, 1 full, 5 half, 1 full. Starting at -2520 (0deg minus 7 full turns) */
@keyframes rotate-5half-1full-x2 { 
  from { transform: rotateZ(-2520deg); }  
  4.166% { transform: rotateZ(-2340deg); }
  8.333% { transform: rotateZ(-2340deg); }
  12.5% { transform: rotateZ(-2160deg); }
  16.666% { transform: rotateZ(-2160deg); }
  20.833% { transform: rotateZ(-1980deg); }
  25% { transform: rotateZ(-1980deg); }
  29.166% { transform: rotateZ(-1800deg); }
  33.333% { transform: rotateZ(-1800deg); }
  37.5% { transform: rotateZ(-1620deg); }
  41.666% { transform: rotateZ(-1620deg); }
  45.833% { transform: rotateZ(-1260deg); } /* Full turn */
  50% { transform: rotateZ(-1260deg); }
  54.166% { transform: rotateZ(-1080deg); }
  58.333% { transform: rotateZ(-1080deg); }
  62.5% { transform: rotateZ(-900deg); }
  66.666% { transform: rotateZ(-900deg); }
  70.833% { transform: rotateZ(-720deg); }
  75% { transform: rotateZ(-720deg); }
  79.166% { transform: rotateZ(-540deg); }
  83.333% { transform: rotateZ(-540deg); }
  87.5% { transform: rotateZ(-360deg); }
  91.666% { transform: rotateZ(-360deg); }
  95.833% { transform: rotateZ(-0deg); } /* Full Turn */
  to { transform: rotateZ(-0deg); } 
}

/* 5 half rotations, 1 full, 5 half, 1 full. Starting at -2700 (-180deg minus 7 full turns) */
@keyframes rotate-5half-1full-x2-alt { 
  from { transform: rotateZ(-2700deg); }
  4.166% { transform: rotateZ(-2520deg); }
  8.333% { transform: rotateZ(-2520deg); }
  12.5% { transform: rotateZ(-2340deg); }
  16.666% { transform: rotateZ(-2340deg); }
  20.833% { transform: rotateZ(-2160deg); }
  25% { transform: rotateZ(-2160deg); }
  29.166% { transform: rotateZ(-1980deg); }
  33.333% { transform: rotateZ(-1980deg); }
  37.5% { transform: rotateZ(-1800deg); }
  41.666% { transform: rotateZ(-1800deg); }
  45.833% { transform: rotateZ(-1440deg); } /* Full Turn */
  50% { transform: rotateZ(-1440deg); }
  54.166% { transform: rotateZ(-1260deg); }
  58.333% { transform: rotateZ(-1260deg); }
  62.5% { transform: rotateZ(-1080deg); }
  66.666% { transform: rotateZ(-1080deg); }
  70.833% { transform: rotateZ(-900deg); }
  75% { transform: rotateZ(-900deg); }
  79.166% { transform: rotateZ(-720deg); }
  83.333% { transform: rotateZ(-720deg); }
  87.5% { transform: rotateZ(-540deg); }
  91.666% { transform: rotateZ(-540deg); }
  95.833% { transform: rotateZ(-180deg); } /* Full Turn */
  to { transform: rotateZ(-180deg); }  
}
!

JS 

              
                (function() {

  var clock = document.querySelector('.clock');
  var button = document.getElementById("toggle");
  
  var toggle = function() {
    
    clock.classList.toggle("ticking");
    
  };
  
  button.addEventListener('click', toggle); 
  
})();
!
999px

Console