Anything related to things that are too small to see them with the eye, and the tools used to observe them.
This space is quite general in scope - microscopes, microbiology, small component electronics, questions about buying optical components, etc.
I left a slide with some algae and rotifers sitting on the microscope. After it dried up I was able to see several of these flower-like shapes. Not a pattern that I had seen before, and I a don't know what about the drying process lead to this particular shapes forming.
Ah, now that I think about it I did add some nutrients to support algal growth, so these could be crystals.
Interesting. Thanks!