Ambiguous figures, of which the Serendip logo (circa 1994-95) is one example, make possible some interesting observations bearing on the existence and meaning of "free will".
In most people's minds, "free will" has two relatively distinct properties. The first is the idea that what one does is in some sense "free", that is "not determined by something else". The second is the idea that one can oneself control what one does.
Notice that the Serendip logo can sometimes be seen as consisting of green arrows pointing to the right, and at other times as yellow arrows pointing to the left, but is infrequently or never seen as both (unless one tries very hard).
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