Ibn al-Haytham's Experiment', artist's impression

Artist’s impression of Ibn al-Haytham experimenting with a small box, by Ali Amro.

Following his dark room observation, Ibn al-Haytham made more experiments and understood: light bounced off the objects outside, travelled through the hole in the wall of the room, and made the image. He drew comparisons to the human eye – the dark room was like an eye and that is how people see.