One thing I've always been curious about was Da Vinci's Vitruvian Man... that dude standing with arms wide open. Da Vinci was one hell of a illustration, and did an amazing job drawing perfect anatomy
Being a great fan of comic books, I always loved the visual identities used for some famous characters. Most super-heroes logos are like a incorporation of many aspects of the characters and their superpowers. I always liked Hulk logo as everytime I look at it I always remember his famous quote "Hulk Smash".