This is shot of a water glass I took while on a trip to Raleigh.
I really like caustics. Rendering CG glass can take a long time to make it look good. Added on top of that, caustics aren’t normally automatic, so they can be fairly hard to get right. Caustics are fun to play with, because by just changing the orientation of the glass, liquid or both, you can completely change the pattern the caustics make.