Blaschka Marine Invertebrate Glass Figures.

Tony Cabral said it best:

The Blaschkas were a father and son pair of glassblowers who made a number of gorgeous models of sea life that now reside at Cornell and Harvard. These things are tiny and flawless. What pushes the limits of sanity is that these were made in the mid 19th century. Not only was there no advanced machinery involved, they couldn't even phone a friend to say, "Look what I did"

See their amazing works at the Blaschka Marine Invertebrates at Cornell University. (Thanks Tony!)