This paper looked at using bubbles as a form of human-computer interaction. They call this ephemeral user interfaces and their properties can be use for "novel playful and emotionally engaging interactions." The system included a round transparent tabletop surface with a diameter of about 20 inch and a thin layer of dark liquid on top. After blowing soap bubbles on the surface, the position and movement of the bubbles can be tracked by a camera. The bubbles leave a visible ring on the surface of the glass plate. A user can blow on the bubble or push it with the hand. They determine that this type of systems can be used in the home and entertainment. They imagine being able to use this in the form of "buttons on demand,"and ambient displays.
Analysis
I don't really see how this interface can be useful. It seems a bit too short term. Movement is a big hassle, and accuracy (blowing on the bubbles to move them) seems to be lacking. Also, the other method requires a bit of luck and finesse. I don't think this will be a good method of interaction
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