Ketsuro-graffiti: a canvas with computer generated water condensation

Water condensation (Ketsuro in Japanese) is a natural canvas found on a car window or a glass on which we often scribble figures, illustrations, and messages. Hans used water condensation as a tool for expression [Haacke 1963]. Dewy is a condensation display that shows texts and patterns by controlling 3 x 5 peltier devices [Parkes and Offenhuber 2007]. However, in this system, users cannot directly touch and scribble on the condensation with their fingers.