This physical computing "game" incorporates a mug and a sponge. The mug has a gyroscope in it, such that it can detect when it is being tipped over, and the sponge is affixed to a surface such that it hides a small hose feeding into its underside. When the (empty) mug is registered as being tipped over, water will flow through the hose and the sponge will visibly dampen and expand. This gives the illusion that invisible, intangible water is being poured from the mug, and being made visible and tangible as soon as it is absorbed by the sponge. To "reset" the experience, the sponge can be wrung out by pressing down on it and emptying out the "now-visible" water into an adjacent drain, to be reused by the hose.
