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              svg(viewBox="0 0 1 1")
  defs
    clipPath(id="puzzle" clipPathUnits="objectBoundingBox")
      path(d="M0 0.7763157894736841H0.23684210526315788C0.3289473684210526 0.7763157894736841 0.35526315789473684 0.7236842105263157 0.2894736842105263 0.6578947368421053 0.22368421052631576 0.5921052631578947 0.3157894736842105 0.5526315789473684 0.39473684210526316 0.5526315789473684 0.47368421052631576 0.5526315789473684 0.5657894736842105 0.5921052631578947 0.5 0.6578947368421053 0.43421052631578944 0.7236842105263157 0.4605263157894737 0.7763157894736841 0.5526315789473684 0.7763157894736841H0.7763157894736842V0.5526315789473684C0.7763157894736842 0.4605263157894737 0.8289473684210525 0.4342105263157894 0.894736842105263 0.5 0.9605263157894737 0.5657894736842106 1 0.4736842105263157 1 0.39473684210526305 1 0.3157894736842106 0.9605263157894737 0.2236842105263157 0.894736842105263 0.2894736842105263 0.8289473684210525 0.3552631578947367 0.7763157894736842 0.32894736842105265 0.7763157894736842 0.23684210526315796V0H0V0.7763157894736841Z")
      

.grid
  - var n = 9;
  - while (n > 0)
    .item-box
      .item-container
        - var k = 4;
        - while (k > 0)
          .piece
            .puzzle
          - k--;
    - n--
            
          
!
            
              $gs: 80vmin; //galery size
$rat: .77632; //puzzle ratio
$numi: 9; //num items
$td: .45s; //transition dureation
$is: $gs/3; //item size

$pcs: $is*.5; //piece size
$pzs: $pcs/$rat; //puzzle size
$ptrs: 100% * (1- $rat); //puzzle translate 
$bgs: 200%*$rat;//puzzle bg size

$ef: cubic-bezier(0.65, 0.05, 0.36, 1); //easing function
$imgIds: 1011, 1006, 883, 1074, 823, 64, 65, 839, 832;
*, *:before, *:after{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  overflow: hidden;
  background: #fff3e0;
}
svg{
  width: 0;
  height: 0;
  display: block;
}
.grid{
  width: $gs;
  margin: 10vmin auto;
  display: flex;
  flex-wrap: wrap;
  transform-style: preserve-3d;
  box-shadow: 0px 0px $gs*.1 $gs*.05 rgba(0, 0, 0, .1), inset 0px 0px  $gs*.1 $gs*.05 rgba(0, 0, 0, .1);
  perspective: 2000;
}
.item-box{
  position: relative;
  width: $is;
  height: $is;
  transform-style: preserve-3d;
  cursor: pointer;
  transition: all $td*.5 $ef $td*.5; 
  @for $i from 0 to $numi{
    $ii: $i+1;
    &:nth-child(#{$ii}){
      $id: nth($imgIds, $ii);
      .puzzle:before{
        background-image: url('https://unsplash.it/600/600?image=#{$id}');
      }
    }
  }
  &:hover{
    transform: scale(1.25,1.25);
    box-shadow: 0px 0px 16px 8px rgba(0, 0, 0, .2);
    .puzzle{
      transform: translateX(0) translateY(0) translateZ(1px) rotateX(0) rotateY(0) ;
       opacity: 1;
    }
}
.item-container{
  position: absolute;
  top: 50%;
  left: 50%;
  transform-style: preserve-3d;
  }
}
.piece{
  position: absolute;
  width: $pcs;
  height: $pcs;
  transform-style: preserve-3d;
  @for $i from 0 to 4{
    $ii: $i+1;
    $x: cos(90*$i - 135deg)*sqrt(2)*50% - 50%;
    $y: sin(90*$i - 135deg)*sqrt(2)*50% - 50%;
    &:nth-child(#{$ii}){
      transform: translateX($x) translateY($y) rotate(90deg*$i);
      .puzzle{
        //transition-delay: $i*.025s;
        //transition-duration: $td - .13*$i;
        &:before{
          background-position: $x + 100% $y + 100%;
          transform: rotate(-90deg*$i);
        }
      }
    }
  }
}
.puzzle{
  position: absolute;
  width: $pzs;
  height: $pzs;
  background-color: #000;
  clip-path: url(#puzzle);
  opacity: .8;
  //animation: init $td $ef  .5s;
  transform: translateX(-$ptrs) translateY(-$ptrs) translateZ(0px) rotateX(.5turn) rotateY(.5turn);
  transition: all $td $ef;
  &:before{
    content: "";
    position: absolute;
    width: $pzs;
    height: $pzs;
    background-size: $bgs;
  }
}

@keyframes init{
  from{
    transform: translateX(0) translateY(0) translateZ(1px) rotateX(0) rotateY(0);
  }
}
            
          
!
999px
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