Aquascope

An aquascope is a simple tool for observing the underwater world. The cone-shaped aquascope has a transparent bottom and an opening at the top for looking through. The bottom part is pushed into the water, which prevents the refraction of light at the water surface from distorting the view. You can purchase ready-made aquascopes, but you can also make one yourself, for example from a plastic bucket and a sheet of plexiglass.