Camera obscura

The Camera obscura is an optical phenomenon created by Leonardo da Vinci. Using acid, he created a pinhole in the wall of Piero de' Medici's warehouse which the outside light passed through and projected an image on the wall inside.

History
Leo created a camera obscura at the Medici Palace to help a captured Machiavelli. He projected an image of his mouth on the wall, scaring off the guards. The image, later projected on Lisa Gherardini's stomach, warned them that Piero de' Medici and his guards were on their way to the warehouse. (Servant of Florence)