"But does anyone really think that, say, rubbing your fingers together would be some horrendous input method merely because it doesn't have a physical object?"

"But does anyone really think that, say, rubbing your fingers together would be some horrendous input method merely because it doesn't have a physical object?" It's a good question, but I don't think the answer is as clear as you make it out to be. Elsewhere, Pavlus has written about Brett Victor, and some of what he's saying here is an extension of Victor's ideas about interface design. http://worrydream.com/ABriefRantOnTheFutureOfInteractionDesign/ http://worrydream.com/ABriefRantOnTheFutureOfInteractionDesi... My own view of the camera in Glass is that it's the lynchpin for a good gestural interface. But when I imagine how this would work, I instinctively prefer the idea of using a pen (or something similar) to my empty hands. Perhaps it's because I've done a lot of painting and drawing, but I actually feel that the tool makes me more expressive, not less. In other words, it brings a level of precision to gestures that unaided hands don't supply - not unlike the way a conductor uses a baton when, strictly speaking, he could get by with just his arms and hands.