This noise torus also gives rise to the following effect.
On one occasion I saw a phosphene where the green patch was in two lobes, this time with two additional lines along the top and bottom edges.
On yet another occasion I had been watching the central line for some time when it suddenly switched to a leaf shape and back twice.
I had barely begun to wonder what might give rise to the leaf when I saw a translucent circle expand from the centre of my view, first upwards then downwards. The overlap formed the leaf shape.
© Copyright 2021 Andrew Jarvis.