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HTML

              
                
<html>
  <head>
    <title>Air keyboard with Leap Motion</title>
    <script src="//js.leapmotion.com/0.2.0-beta1/leap.min.js"></script>
    <style>
      
    </style>
  </head>
  <body>
    <div id="app" class="show-hands">
      <div id="scene">
        <div id="cube" class="cube">
          <div class="face tp"></div>
          <div class="face lt"></div>
          <div class="face rt"></div>
          <div class="face ft"></div>
          <div class="face bk"></div>
        </div>
        <div id="finger" class="cube finger">
          <div class="face tp"></div>
          <div class="face lt"></div>
          <div class="face rt"></div>
          <div class="face ft"></div>
          <div class="face bk"></div>
        </div>
        <div id="sphere" class="cube sphere">
          <div class="face tp"></div>
          <div class="face lt"></div>
          <div class="face rt"></div>
          <div class="face ft"></div>
          <div class="face bk"></div>
        </div>
      </div>
    </div>
     <div class="keyboard">
       <div class="key">
         B
       </div>
       <div class="key">
         C
       </div>
       <div class="key">
         D
       </div>
       <div class="key">
         E
       </div>
       <div class="key">
         F
       </div>
    </div>
     <audio src="http://www.noogn.net/leapmotion/B.wav"></audio>
     <audio src="http://www.noogn.net/leapmotion/C.wav"></audio>
     <audio src="http://www.noogn.net/leapmotion/D.wav"></audio>
     <audio src="http://www.noogn.net/leapmotion/E.wav"></audio>
     <audio src="http://www.noogn.net/leapmotion/F.wav"></audio>
  </body>

</html>

              
            
!

CSS

              
                *,*:before {
        margin: 0;
        padding: 0;
        border: 0;
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
      }

      button {
        position: relative;
        z-index: 999;
        padding: .5em;
      }

      #app {
        position: absolute;
        width: 100%;
        height: 100%;
        font-size: 200%;
        overflow: hidden;
        background-color: #101010;
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
        -webkit-perspective: 1000;
        perspective: 1000;
      }

      #scene,
      #scene:before {
        position: absolute;
        left: 50%;
        top: 50%;
        width: 40em;
        height: 40em;
        margin: -20em 0 0 -20em;
        border: 4px solid #A0A0A0;
        background-color: rgba(255,255,255,.1);
        background-image:
          -webkit-linear-gradient(rgba(255,255,255,.4) .1em, transparent .1em),
          -webkit-linear-gradient(0deg, rgba(255,255,255,.4) .1em, transparent .1em),
          -webkit-linear-gradient(rgba(255,255,255,.3) .05em, transparent .05em),
          -webkit-linear-gradient(0deg, rgba(255,255,255,.3) .05em, transparent .05em);
        background-image:
          linear-gradient(rgba(255,255,255,.4) .1em, transparent .1em),
          linear-gradient(90deg, rgba(255,255,255,.4) .1em, transparent .1em),
          linear-gradient(rgba(255,255,255,.3) .05em, transparent .05em),
          linear-gradient(90deg, rgba(255,255,255,.3) .05em, transparent .05em);

        background-size: 5em 5em, 5em 5em, 1em 1em, 1em 1em;
        background-position: -.1em -.1em, -.1em -.1em, -.05em -.05em, -.05em -.05em;
        -webkit-transform-style: preserve-3d;
        transform-style: preserve-3d;
      }

      #scene {
        -webkit-transform: rotate3d(1, 0, 0, 75deg);
        transform: perspective(650px) rotate3d(1, 0, 0, 75deg)
      }

      #scene:before {
        content: '';
        -webkit-transform-origin: 50% 0;
        transform-origin: 50% 0;
        -webkit-transform: rotate3d(1, 0, 0, 90deg);
        transform: rotateX(90deg);
      }

      .cube {
        background-color: red;
        -webkit-transform-style: preserve-3d;
        transform-style: preserve-3d;
        -webkit-transform: translate3d(19.5em, 19.5em, 0em);
        transform: translate3d(19.5em, 19.5em, 0em);
      }

      .finger,
      .sphere {
        position: absolute;
        left: 50%;
        top: 50%;
        width: 1em;
        height: 1em;
        margin: -.5em 0 0 -.5em;
        -webkit-transform-style: preserve-3d;
        transform-style: preserve-3d;
        -webkit-transform: translate3d(14.5em, 14.5em, 0);
        transform: translate3d(14.5em, 14.5em, 0);
      }

      .finger {
        opacity: .8;
        height: 3em;
      }

      .sphere {
        opacity: .3;
        display: none;
        font-size: 100px;
      }

      .show-hands .sphere {
        display: block;
      }

      .face {
        position: absolute;
        width: 1em;
        height: 1em;
        background-color: inherit;
        -webkit-transform-style: preserve-3d;
        transform-style: preserve-3d;
        -webkit-transform-origin: 0 0;
        transform-origin: 0 0;
        -webkit-box-shadow: inset 0 0 0 1px rgba(255,255,255,.9);
        box-shadow: inset 0 0 0 1px rgba(255,255,255,.9);
      }

      .cube .face.tp {
        -webkit-transform: translate3d(0, 0, 1em);
      }
      .cube .face.ft {
        -webkit-transform: rotate3d(1, 0, 0, 90deg) translate3d(0, 0, -1em);
        transform: rotate3d(1, 0, 0, 90deg) translate3d(0, 0, -1em);
      }
      .cube .face.bk {
        -webkit-transform: rotate3d(1, 0, 0, 90deg);
        transform: rotate3d(1, 0, 0, 90deg);
      }
      .cube .face.lt {
        -webkit-transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 0);
        transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 0);
      }
      .cube .face.rt {
        -webkit-transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 1em);
        transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 1em);
      }
      .finger .face.tp {
        -webkit-transform: translate3d(0, 0, 1em);
        transform: translate3d(0, 0, 1em);
        height: 3em;
      }
      .finger .face.ft {
        -webkit-transform: rotate3d(1, 0, 0, 90deg) translate3d(0, 0, -3em);
        transform: rotate3d(1, 0, 0, 90deg) translate3d(0, 0, -3em);
      }
      .finger .face.bk {
        -webkit-transform: rotate3d(1, 0, 0, 90deg);
        transform: rotate3d(1, 0, 0, 90deg);
      }
      .finger .face.lt {
        -webkit-transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 0);
        transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 0);
        height: 3em;
      }
      .finger .face.rt {
        -webkit-transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 1em);
        transform: rotate3d(0, 1, 0, 90deg) translate3d(-1em, 0, 1em);
        height: 3em;
      }

#app.bg0 {
  background: purple;
}

#app.bg1 {
  background: blue;
}

#app.bg2 {
  background: green;
}

#app.bg3 {
  background: orange;
}

#app.bg4 {
  background: pink;
}

.keyboard {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  background: #fff;
  color: #fff;
  overflow: hidden;
}

.key {
  width: 20%;
  border: 1px solid #ccc;
  height: 200px;
  text-align: center;
  line-height: 200px;
  font-size: 50px;
  font-family: Arial, Helvetica, sans-serif;
  float: left;
}

.play {
  box-shadow: 0 0 25px rgba(0,0,0, 1);
  background: #c00;
}
              
            
!

JS

              
                function move(node, posX, posY, posZ, rotX, rotY, rotZ) {
      var style = node.style;
      style.transform =
      style.webkitTransform = 'translate3d(' + posX + 'px, ' + posY + 'px, ' + posZ + 'px) ' +
                              'rotate3d(1, 0, 0, ' + rotX + 'deg) rotate3d(0, 0, 1, ' + rotZ + 'deg)';
    }

    function getNode(id, templateNode) {
      var node  = pool[id];

      if (!node) {
        node  = templateNode.cloneNode(true);
        node.id = id;
        node.style.backgroundColor = randomColor();

        scene.appendChild(node);
        pool[id] = node;
      }

      return node;
    }

    function randomColor() {
      return '#' + Math.floor(Math.random() * 0x1000000).toString(16);
    }

    var app = document.getElementById('app');
    var scene = document.getElementById('scene');
    var sphereTemplate = document.getElementById('sphere');
    var fingerTemplate = document.getElementById('finger');
    var sounds = document.getElementsByTagName('audio');
    var keys = document.getElementsByClassName('key');

    var pool = {};

    Leap.loop(function(frame) {
      var ids = {};
      var hands = frame.hands;
      var pointables = frame.pointables;
      var fingers = frame.fingers;
      
      // sort fingers from left to right, not first finger to appear
      var sortedFingers = frame.fingers.sort(function(a, b) {
        var aX = a.tipPosition[0];
        var bX = b.tipPosition[0];
        if (aX < bX) {
          return -1;
        }
        if (aX > bX) {
          return 1;
        }   
        return 0;
         
      });
      
      if(sortedFingers.length) {
        
        for(var i = 0; i < sortedFingers.length; i++) {
          var finger = sortedFingers[i];
          var y = finger.tipPosition[1];
          
          if(y < 100) {
            app.className = 'show-hands bg' + i;
            sounds[i].play();
            keys[i].className += ' play';
          } else {
            keys[i].className = 'key';
          }
        }
        
        
      }

      for (var i = 0, pointable; pointable = pointables[i++];) {
        var posX = (pointable.tipPosition[0] * 3);
        var posY = (pointable.tipPosition[2] * 3) - 200;
        var posZ = (pointable.tipPosition[1] * 3) - 400;
        var dirX = -(pointable.direction[1] * 90);
        var dirY = -(pointable.direction[2] * 90);
        var dirZ = (pointable.direction[0] * 90);
        

        node = getNode(pointable.id, fingerTemplate);

        move(node, posX, posY, posZ, dirX, dirY, dirZ);

        ids[pointable.id] = true;
      }

      for (var id in pool) {
        if (!ids[id]) {
          scene.removeChild(pool[id]);
          delete pool[id];
        }
      }

    });
              
            
!
999px

Console