Rain activated art

Rain activated art is a kind of street art, called "rainworks" by the creator, Seattle artist Peregrine Church. It utilizes a superhydrophobic coating on a sidewalk which is invisible when dry, but when it rains, reveal a pattern created by the artist. As of March 2015, there are approximately 25 installations in Seattle, supported by a grant from Awesome Foundation, and several more commissioned pieces at and around the Hands On Children's Museum in Olympia, Washington. Church started creating the works in Seattle in May, 2014.