Knowledge

Facts, science and history of optical illusions.
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Bezold Effect

How do optical illusions work?

How to create optical illusion photos (for social media)

Foreshadowing

The shadow of this cameraman on the shirt of the man on the right creates a dirty optical illusion

Source/credit: Woking Peregrine Project

If you check the shadow on the T-shirt of the man on the right, you will see an amazing optical illusion. It almost looks Photoshopped, it is that perfect.

The shadow comes from the cameraman and the viewfinder of his camera, but surely looks like something not suitable for work.

More optical illusions:

Three Rings Forced Perspective Illusion

Videos

Christmas candle

a dirty mind