Images 1 and 2: Living pluteus larva of the sea biscuit Clypeaster subdepressus under polarized light microscopy. Only the skeleton remains visible. Photos by Bruno C. Vellutini (Wikimedia; Flickr); cc-by-sa

Image 3: Pluteus larva via ccNeLaS

Image 4: Developing pluteus larva. Via Wikimedia. Public domain

Image 5: Sea urchin development tattoo via The Loom

Caption: “Greetings! Here’s a pic of my science tat. I studied sea urchin development for my dissertation. Upon completion 2 yrs ago, I awarded myself this tat for my academic achievement. The tat is of a sea urchin egg, 2 cell embryo, blastula, gastrula, prism stage and pluteus larval stage. Or as my friend’s say, an orange developing into an Alien face-grabber.”

I don’t know what to call this pattern, but I like it!

Image 1: “The Maze” by Debralee Wiseberg (link and another gallery)… I think it’s corroded metal?

Image 2: 2,2-(Bipyridine)(Naphthalene)-fusion melt (25x)

Herb Comess. Honorable Mention, 1994 Nikon Small World Photomicrography Competition (link)