html/css hexagon with image inside

Question

Is there a chance to place an image inside a hexagon shape? I'm used to hexagonal shaped cells in html, but I could'nt get it filled with an (background?) image.

Here is what I have tried :

.top {
  height: 0;
  width: 0;
  display: block;
  border: 20px solid red;
  border-top-color: transparent;
  border-right-color: transparent;
  border-bottom-color: red;
  border-left-color: transparent;
}
.middle {
  height: 20px;
  background: red;
  width: 40px;
  display: block;
}
.bottom {
  height: 0;
  width: 0;
  display: block;
  border: 20px solid red;
  border-top-color: red;
  border-right-color: transparent;
  border-bottom-color: transparent;
  border-left-color: transparent;
}

<div class="hexagon pic">
  <span class="top" style="background: url(http://placekitten.com/400/400/)"></span>
  <span class="middle" style="background: url(http://placekitten.com/400/400/)"></span>
  <span class="bottom" style="background: url(http://placekitten.com/400/400/)"></span>
</div>


<div class="hexagon">
  <span class="top" style="overflow: hidden;"><img src="http://placekitten.com/400/400/" /></span>
  <span class="middle" style="overflow: hidden;"><img src="http://placekitten.com/400/400/" /></span>
  <span class="bottom" style="overflow: hidden;"><img src="http://placekitten.com/400/400/" /></span>
</div>

<div class="hexagon">
  <span class="top"><img src="http://placekitten.com/400/400/" /></span>
  <span class="middle"><img src="http://placekitten.com/400/400/" /></span>
  <span class="bottom"><img src="http://placekitten.com/400/400/" /></span>
</div>

here is a fiddle: http://jsfiddle.net/jnz31/kGSCA/