Aamzing animation showing the development of a starfish, from the first cell divisions to adulthood:
The animation was made with Blender. And there’s a cool poster with a cladogram in the sand, illustrating the phylogeny of echinoderms.

Check the original post.
P.S. For comparison, once I tried to create cell divisions in Blender and the best I could do was a legless octopus.

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