It makes sense that this would be developed in Seattle, where it is wet a good portion of the year.
Like a new modern version of invisible ink, superhydrophobic coatings can also be used to create hidden street art that stays invisible until it gets wet. Peregrine Chuch, a Seattle-based street artist, created a series of public works of street art called Rainworks using the same sort of hydrophobic coatings that we saw being used in Germany to combat public urination.
Church creates the artwork spontaneously because he has been assured by the city authorities that what he is doing is legal – the coating is non-toxic, non-permanent, only sometimes visible, and his works don’t advertise anything. He says that, depending on how much the sidewalk in question is used, his pieces may last between 4 months and a year, but are most vivid within the first few weeks of application.
His works are diverse, and range from artistic drawings to fun and motivational messages to a hop-scotch game that can only be played when it’s wet.
more via Artist Creates Water-Activated Street Art To Make People Smile On A Rainy Day | Bored Panda.