Light travels in a straight straight line. By having a very dark room (no light travels) and a single hole from a light source will allow lights to travel tak bengkok2. So it went straight to the wall. For example, light from the ground will travel straight up and be at the uppest wall. While light from the sky, will travel straight down and be at the lowest wall.
sebab tu gambar terbalikk weeeeeeeeeee Ibnu Haytham yang discover this first (used to be known as camera obscura) Yay for muslim's scientist!! :DDDD
ANDD YEYYYY!!! nak buat la nanti! ;]