"Ibn al-Haytham's Discovery", artistic impression

Ibn al-Haytham in a dark room examining the light projected on the wall, by Ali Amro.

In Egypt, Ibn al-Haytham focused on making major breakthroughs in understanding light and vision. During that time, he made his greatest scientific breakthrough. While sitting in a dark room, the story goes, he noticed a bright light on the wall that turned out to be an image of objects outside his room.