Maxwell's Fishpond
makes ripples in water stop spreading out and refocusses them. Always. Wherever they start.

I made the first prototype at home using a circular chocolate box, some borrowed plasticine (thanks, haberkids!), and printed cutouts as guides for depth. Astoundingly, given how crude it was, it mostly worked.

See a description and a discussion of a proper version here: Intro with links to paper & video ...


Edit: apologies for the lack of explosions and/or poisonous chemicals.
(haberman is singing in the changes, Tue 14 Aug 2012, 22:51, Reply)