Follow the link to a video of coral under a confocal laser microscope. Scroll down to first honorable mention in the 2012 International Science and Engineering Visualization Challenge.
I should have brought some corals in while I had access to one of these in a previous job! Pretty cool and also hard to do with something that isn't sliver thin under one of these scopes.
http://scim.ag/UJwFrL
David