by Marie Curie 
Da Vinci Notes 05: The Eye and the Camera Obscura
A whole piazza comes upside down through a hole the size of a millet grain. If the eye is such a chamber, what turns the world the right way up? I boil an eye in egg white to find out.
Leonardo darkens a room, works out how the hole trades sharpness for light, and models the eye with a second crossing that Kepler later disproved.
Leonardo da Vinci
November 8, 2026
28 min