Giotto
Vasari also tells the story that the Pope wanted to see if Giotto would be a good artists to paint some important pictures. The Pope sent a messenger asking Giotto to send him back a small picture. Instead of doing a painting, which would take many days, Giotto drew, in red paint, a circle that was so perfect that it seemed as though it was drawn using a pair of compasses. Giotto told the messenger to give that to the Pope.