The concept is for your child to create pictures on the windows, - which Eden did, but then she put the sponge brush away and started soaking the foam in the water. She told me she was washing them 'til they were nice and clean, then hanging them out to dry. She also used some squares as sponges, cleaning up the drops of water on the floor ("is messy, messy, messy. That's better, hooray!"). She's been at it for an hour and a bit now, with no signs of abating!