Some of the constraints of our project include the printout box itself. It can really only be used in one way, and we plan to include directions indicating something to the effect of "Please insert your hand face down underneath the opening below." The directions themselves are a constraint in the sense that the audience is given one choice of action. In a sense, the project itself constrains the user, by crudely attempting to narrow down their race to a set of predetermined values.
So far the sensors I've seen/used in this class have made sense, even with what little experience I have with circuits. Button sensors physically indicate how they are to be used--a big red button generally means "press and something will happen". I haven't made/designed any circuits myself, though, so I don't know a whole lot.
Phones are the first thing that come to mind when considering devices whose function relies on sound. They ring, and we know to pick them up. Also, they would be obsolete without the sound travelling between both callers.
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