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According to Dan Saffer's, Designing Gestural Interfaces, gestures can be made up of these components:
Number of Touchpoints / Combinations of Touchpoints
Number of Participants.
In the interest of creating more memorable buckets, how about this:
Gestural devices measure presence, intent and identity by sensing:
How often an event occurs
The sequence in which events occur
Where the events occur
WHAT DO YOU THINK?