div#quad { 
  background-color: #fff; 
  font-size: 0; width: 100%; 
  margin: 0 auto;
  
}
div#quad figure { 
  margin: 0; width: 50%; 
  height: auto; transition: 1s; 
  display: inline-block; 
  position: relative; overflow: hidden; 
}
div#quad figure:hover { cursor: pointer; z-index: 4; }
div#quad figure img { width: 100%; height: auto; }
div#quad figure:nth-child(1) { transform-origin: top left; }
div#quad figure:nth-child(2) { transform-origin: top right; }
div#quad figure:nth-child(3) { transform-origin: bottom left; }
div#quad figure:nth-child(4) { transform-origin: bottom right; }
div#quad figure figcaption { 
  margin: 0; opacity: 0; 
  background: rgba(0,0,0,0.3); 
  color: #fff; padding: .3rem; 
  font-size: 0.55rem; 
  position: absolute; 
  bottom: 0; width: 100%;
	transition: 1s 1s opacity; 
}
.expanded { transform: scale(2); z-index: 5;  }
div#quad figure.expanded figcaption { opacity: 1; }
div.full figure:not(.expanded) { pointer-events: none; }