Why is it that only after I poke around for a while do I realize that the thing I should have done in the first place is check Wikipedia?

Oh, and I don’t know folks…. I may have to give up this whole ‘a picture with every post’ thing; it’s just getting to be too much of a stretch. Maybe every other post or something? What do you say? Here are some images from the first page of Google Image search for ‘eigen’:

randomness