In the continuing saga of 'things-I-wish-I-saw-on-the-playground' is the the kinetic use of rainwater...like on this Rube Goldberg building facade in Dresden, Germany, which also plays music! Plus I love funnels. If you know the designer of this, please enlighten me!
[photos by Gordon Tarpley, Robert and Rainer Fritz]
UPDATE: thanks to reader Bush for letting me know the designers are Annette Paul, Christoph Roßner, and André Tempel. http://www.kunsthof-dresden.