Cereal Box Eclipse Viewer

Looking directly at the sun is extremely dangerous, damage to the retina occurs in a few seconds and is not reversible. During a solar eclipse (moon blocking the sun) it is very tempting to look directly at this event, doing so usually results in eye damage.

The event can be safely viewed by looking at a projected image of the sun.

A small hole in a piece of foil acts much like a lense, creating an image. A device that uses a small hole to create an image is called a pin-hole viewer.