Remember when you were in school and decided to doodle in class while the teacher rambled on about the history of Cambodia? The 15th-century remembers. That’s exactly what bored students did 600 years ago. And honestly these drawings don’t look that much different than todays. Actually, the bird doodles on this page remind me a little of the bird on the back of the U.S. one dollar bill which wasn’t designed until 1957. More of these doodles can be seen here.