Lindsay writes, "It's from Edwin Abbott's Flatland. The idea is that if your eye was one the same 2D plane, looking at the circle from the tip of the point on the right, you would actually perceive the 2D shape (the circle) as a 1D shape (the line). It's a reminder for me that if you're so entrenched in something, you won't be able to see the big picture and, therefore, you should try to keep perspective."
Flatland at Google Books. More at Wikipedia.
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