Try to do what this guy does. It’s near impossible.
[EDIT:] Reader ‘The Queen of Light and Joy’ says: “There’s actually a story that goes along with the perfect circle. Before Filippo Brunelleschi was asked (there was actually a completion) to build the dome (Florence cathedral) he proved his artistic prowess (to the Cathedral Vestry Board) by sending the perfect circle. They couldn’t deny his skill at that point.”