In Spanish multi-media artist Ana Soler’s most recent installation, Causa-Efecto (Cause and Effect), which we spotted over at CollabCubed, she transformed the Mustang Art Gallery in Alicante into a ballboy’s worst nightmare — or best daydream, depending on his work ethic. Soler filled the gallery with over 2000 tennis balls, arranged so as to create the illusion that they were bouncing all over the place, each trajectory spanning rooms or stairwells or just bopping around in circles. Click through to see some photos from the exhibit — it just might put a little bounce in your step.