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Knowledge Cats Dirty Minds
Ambiguous Pareidolia Forced Perspective

Knowledge

Facts, science and history of optical illusions.
See all the articles or scroll down to see what you came for.

Is this a bird or a rabbit?

Ambiguous illusions

Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Rainbows are illusions

Types of Optical Illusions

90s Yellow Pages Ad

Credit: DJ Flooring in Yellow Pages

Thanks to this real Yellow Pages advertisement, DJ Flooring in Brighton, UK, had to change their phone number. 

Discontinued Yellow Pages advert with dirty optical illusion

However, the image used in the ad has been around longer than that. It was a popular image in the 90s used by many businesses to grab attention.

Popular illusion in 90s advertising

More optical illusions:

This Patio
Smile!
Giant Ship
Model ship on poles
Half Assed
Magayon and Pangaronon
Beautiful Caterpillar
Birds are not Real
  • Pareidolia
  • Physical illusions
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Poodle on the beach

Poodle or Cocker Spaniel?

a dirty mind

A giant bullfrog in Texas

Giant bullfrog

Animals