<div class="l-wrapper">
  <ul class="rotation rotation--layers">
    <li class="rotation__item item--1"></li>
    <li class="rotation__item item--2"></li>
    <li class="rotation__item item--3"></li>
    <li class="rotation__item item--4"></li>
  </ul>
  
  <div class="progress"></div>
</div>

/* Change Image Animation
-------------------------------*/

$duration: 8s;
$max: 4;
$step: $duration/$max;
$step-perc: percentage(1/$max);

.rotation__item {
  opacity: 0;
  animation: hide $duration step-end infinite;
  
  @for $item from 2 through $max {
    &:nth-child(#{$max}n + #{$item}){
    animation-delay: $step*($item - 1);
    }
  }
}

@keyframes hide {
  0% {
    opacity: 1;
  }
  #{$step-perc} {
    opacity: .3;
    }
  }

/* Progress Bar
-------------------------------*/

.progress {
  width: 0;
  height: 5px;
  margin-top: 3px;
  background: rgba(154, 205, 50,.5);
  animation: timer $duration infinite linear;
}

@keyframes timer {
  100% {
    width: 100%;
  }
}

/* Common
-------------------------------*/

BODY {
  background: #FFF linear-gradient(90deg, rgba(154, 205, 50,.3) 50%, rgba(154, 205, 50,.15) 50%);
  background-size: 2em 2em;
  perspective: 500px;
  perspective-origin: center center;
  }

.l-wrapper {
  width: 95%;
  margin: 0 auto;
  transform-style: preserve-3d;
  }

/* Demo layers
-------------------------------*/

$images: (
  'http://static.colourlovers.com/images/patterns/3342/3342643.png',  
  'http://static.colourlovers.com/images/patterns/2617/2617226.png',
  'http://static.colourlovers.com/images/patterns/3271/3271725.png',
  'http://static.colourlovers.com/images/patterns/2617/2617452.png');

$rotation-height: 270px;
$max: length($images);

.rotation {
  width: 100%;
  height: $rotation-height;
  &__item {
    position: absolute;
    width: 100%;
    height: $rotation-height;
    
    @for $item from 1 through $max {
      &:nth-child(#{$max}n + #{$item}){
        $img: nth($images, $item);
        background: url(#{$img})
        }
      }
    }
}

/* Show layers in 3D
-------------------------------*/

.rotation--layers {
  

  @for $item from 1 through $max {
    .item--#{$item} {
      transform-origin: center bottom;
      transform:  rotateX(70deg) translateZ($rotation-height/$max * ($item - 1));
    }
  }
}