Howeler and Yoon are about to open this interactive piece in Philadelphia in a matter of days. The orbs are made vacuum formed PETG (polyethylene terephthalate glycol), a milky colored, translucent, and recyclable material. Each pod can communicate with the others via radio signal, so people who interact with the pods on land can effect the pods in the water. If more than one user interacts with the pods at a time, more changes occur, encouraging people to play with the installation and create new combinations of color and motion. Side note: I think it's hilarious that after all the advanced electronics and thought that have gone into this project, the tops and bottoms of the floating orbs are held together with binder clips, as you can see in the last picture. Classic.
via Design Boom