I saw this video tonight about how a medical school in Japan tested its young potential surgeons with some really tough hand coordination tests, rather than more routine tests.
One of the tests was to make a 5 mm origami crane, which means the original square was 1 cm in size since the crane folds into a wing height about half of the square size. You can also check the video against real squares you create to get an idea. As one who does origami, I figured I’d give it a go, though I wanted to start with the 2 cm squares first to get an idea of how hard it was going to be. Those are 4X the area, by the way, since area is two dimensional so difference in size on each square side is multiplied by each other! Here are some pics of my results below.