To experiment with the Ganzfeld effect, you need to create a suitable Ganzfeld (or more if you aim for multi-modal Ganzfeld). One way to make a visual Ganzfeld are so-called “Ganzfeld goggles” and a bright light.
To build Ganzfeld goggles, you need ping-pong balls, some sandpaper, a sharp knife (for example those which are used to [...]