optical illusion

Was the Reverend Gill UFO / CE3 encounter some kind of Brocken Spectre-type illusion? Source: https://www.gutenberg.org/files/15884/15884-h/15884-h.htm # Ref: Read the account in Hynek's The UFO Experience (1972). Available here...

[Admin: Thread split from https://www.metabunk.org/threads/debunked-the-sky-was-bluer.494/ ] There is an interesting piece on colour perception on the BBC News site today: Optical illusion: Dress colour debate goes global A debate between family and friends about the colour of a dress for a...

Which of these two planes is higher? And where are they exactly, relative to each other? Now your first impression might be that it's fairly obviously plane B, on the right. It's visibly smaller than the left plane, so must be farther away, and its contrail is obscured by plane A the left...