He was one of the first to use mathematics to understand human anatomy, and his Vitruvian Man drawing shows the relationship between a person's outstretched arms and height.
Drawings of bicycles were found among his volumes of works.
And pulleys like these were probably used on his many architectural projects. He liked to invent ways of making life's chores easier.Not everything back then was fun and games though. He also invented bridges that could be quickly assembled and disassembled so armies could cross rivers without letting their enemies follow.
But along with drawings of bridges, tanks and warships were ways of moving water easily, like this coiled copper tubing that could transport water uphill,
and a room of mirrors that allowed a person to see every angle of themself,
which Katie thought was the coolest thing ever!