Today, March 14, or 3/14, is Pi Day (hmm, Europeans tend to put the day before the month, so I wonder if they do this on April 31 - oops, there is no April 31). Anyway, lift a glass at 1:59 (and 26 seconds, if you're really precise) to Archimedes, who approximated pi in the third century BC. In celebration, here are some LEGO circles. Well, to be precise, these aren't really circles, but instead are polygons with very large numbers of sides, but Flatland taught us that once you got enough sides it was pretty tough to tell the true circles from the high-order polygons. BTW, making circles out of square bricks has been a challenge for LEGO builders, and get incorporated into all kinds of great creations like castles and spaceships.