Where Is The Frog?: Something To Think About

So, where is the frog?

Somewhere there's a frog. Can you find it?

Somewhere there’s a frog. Can you find it?

Camouflage creates its own kind of illusion.  Nature thrives on it, and optical illusions often befuddle humans.

S. Tolansky, a former Professor of Physics at the University of London, wrote a small treatise dealing with visual illusions.  And he argues that camouflage is a practical use of optical illusions.  Camouflage is used by animals and plants primarily as a means of protection from predators and by humans for warfare.  But all illusions are dependent on the health of the eye;  severe astigmatism can destroy the illusion featured below.  Yet, it is well to remember that things are not always what they seem!:oi-1