The Soap Bubble Interface is an ephemeral user interface that uses liquids, smoke and soap bubbles for computer input. Users can generate normal as well as smoke-filled bubbles which drop onto a dark liquid surface. As the bubbles are tracked by a camera from below, the position of the floating soap bubbles can be used to control digital output like graphics, ambient light, or sound. The fragile soap bubbles can be moved either by blowing or touching them cautiously and thus create a special interaction quality which includes that they elude the complete control of users, as the bubbles inevitably burst after a short while. Thus, the soap bubble interface provokes thoughts about durability, control, and materiality of tangible user interfaces.








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