Well only the chemistry geeks might get this one. For everyone else I will provide some hints.

First: This is a lame recreation of a popular photo on pbase. I have even done it myself for real.

Second: The red ball is oxygen and the two yellow balls attached to it are hydrogen.

Third: It's INCORRECT nomenclature is Dihydrogen Oxide.

Fourth: The photo's title is a hint.

Ok you still don't get it? This link will have to be the final hint. http://www.pbase.com/lundy/water_drops

Here are some wonderful REAL examples from other photographers. http://www.pbase.com/tballclevetn/image/20874603 and http://www.pbase.com/nanook1496/drops