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So the user forms an association between the shape of the button and its function, that way they are easier to differentiate in the dark.

Edit: I totally beat the stackexchange answer by 4 minutes :)

Is that really why? That's awesome
Well, I don't work for Apple and I'm not a professional UI designer. So I can't possibly be certain that I know the true motivation for that design decision. But I think it is a reasonable guess.
Same reason why there are bumps on the F and J keys...or raised dots on volume/channel buttons on tv remotes...
I don't think so. Because that's for blind people. And them being right and left, UNDERNEATH the big circle at the top makes that relatively easy, right? I think it maybe that, but definitely something else.