Pinhole

You can build a pinhole camera with a shoe box.

Some people buy eclipse glasses that filter out all harmful ultraviolet and infrared light, as well as the majority of intense visible light. The safest way to view an eclipse, however, is to project its image through a pinhole made in a card onto another piece of white card.

What's a pinhole camera?

These [the eyes of the nautilus] are the simplest eyes of any large living animal -- lensless 'pinholes' that project a hazy and rather dim image onto its retinas.