
Leonardo da Vinci, an Italian Renaissance genius who loved to study how the human body works.
A drawing of a man with his arms and legs spread out, fitting perfectly inside both a circle and a square.
Leonardo made this famous drawing around 1490 to show how the human body has beautiful, balanced measurements.
It is drawn with pen and ink, with neat handwritten notes around it that Leonardo wrote backward, like in a mirror.
Look and you will see the man drawn with two pairs of arms and two pairs of legs, showing different poses at once.
It is kept safe at the Gallerie dell'Accademia in Venice, Italy, and is so delicate it is only shown now and then.
This little drawing has become so famous that you can find it on coins, posters, and even T-shirts.