A pinhole projector is a simple device used to project images. It consists of a dark box or room with a small hole, called a pinhole, on one side. When light passes through this hole, it creates an inverted image of the outside scene on the opposite side of the box. This principle is based on the way light travels in straight lines. Pinhole projectors are often used in educational settings to demonstrate the basic principles of optics and light. They can also be used for viewing solar events, such as a solar eclipse, safely by projecting the sun's image onto a surface without looking directly at it.