Last week I visited the Exploratorium with some friends, and we saw this remarkable drinking fountain. The exhibit cleverly produces a little bit of introspective psychological trickery: It notes that the water is clean, and that the toilet has never been used, but asks why you might hesitate to drink from it? Funny how our brains work sometimes.

Drinking aside, the exhibit reminds me in particular of one other famous fountain.

Other blog entries about things we’ve seen at the Exploratorium:

A homopolar motor somewhat bigger than mine.

Also, an impressive use of a dialog box.