What does this infinite sun converge to? Cut the four L-shapes out…Divide the central L-shape in four L-shapes and cut those out, too…You can go on forever…but it’s already clear at this step, that the sum converges to 2/3 (two of the three squares the original L-shape was made up of)
Simon learned this from an alternating series visualization by Think Twice.
Geeks out of the box 