<div class="gallery">
  <img src="https://picsum.photos/id/174/400/400" alt="a hot air balloon">
  <img src="https://picsum.photos/id/188/400/400" alt="a sky photo of an old city">
  <img src="https://picsum.photos/id/211/400/400" alt="a small boat">
  <img src="https://picsum.photos/id/28/400/400" alt="a forest">
</div>
.gallery {
  --g: 8px;   /* the gap */
  --s: 400px; /* the size */
  
  display: grid;
  border-radius: 50%;
}
.gallery > img {
  grid-area: 1/1;
  width: 400px;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  transform: translate(var(--_x,0),var(--_y,0));
  cursor: pointer;
  z-index: 0;
  transition: .3s, z-index 0s .3s;
}
.gallery img:hover {
  --_i: 1;
  z-index: 1;
  transition: transform .2s, clip-path .3s .2s, z-index 0s;
}
.gallery:hover img {
  transform: translate(0,0);
}
.gallery > img:nth-child(1) {
  clip-path: polygon(50% 50%,calc(50%*var(--_i,0)) calc(120%*var(--_i,0)),0 calc(100%*var(--_i,0)),0 0,100% 0,100% calc(100%*var(--_i,0)),calc(100% - 50%*var(--_i,0)) calc(120%*var(--_i,0)));
  --_y: calc(-1*var(--g))
}
.gallery > img:nth-child(2) {
  clip-path: polygon(50% 50%,calc(100% - 120%*var(--_i,0)) calc(50%*var(--_i,0)),calc(100% - 100%*var(--_i,0)) 0,100% 0,100% 100%,calc(100% - 100%*var(--_i,0)) 100%,calc(100% - 120%*var(--_i,0)) calc(100% - 50%*var(--_i,0)));
  --_x: var(--g)
}
.gallery > img:nth-child(3) {
  clip-path: polygon(50% 50%,calc(100% - 50%*var(--_i,0)) calc(100% - 120%*var(--_i,0)),100% calc(100% - 120%*var(--_i,0)),100% 100%,0 100%,0 calc(100% - 100%*var(--_i,0)),calc(50%*var(--_i,0)) calc(100% - 120%*var(--_i,0)));
  --_y: var(--g)
}
.gallery > img:nth-child(4) {
  clip-path: polygon(50% 50%,calc(120%*var(--_i,0)) calc(50%*var(--_i,0)),calc(100%*var(--_i,0)) 0,0 0,0 100%,calc(100%*var(--_i,0)) 100%,calc(120%*var(--_i,0)) calc(100% - 50%*var(--_i,0)));
  --_x: calc(-1*var(--g))
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-content: center;
  background: #3B8686;
}
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