Optical+Illusions

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Hidden Objects
This is where the picture usually contains a hidden or disguised image. More art than mathematics but very interesting none the less.

The horses are well hidden Same goes for the deer Salvador Dali **Swans Reflecting Elephants**, can you see why its called that

Optical Trickery
Very interesting, mainly scientific in nature, Usually relying on flaws and irregularities in our eyesight and perception to confuse us into thinking something about the picture in different or impossible.

There is no clever animation here. Your eyes are playing tricks!


 * The cafe wall**. The tiles are actually all straight.

Odd Perspectives
Mathematical in nature, these involve geometrically constructions to give a false perspective on things, the eyesight convinces us what it is seeing must be true, even though we know it not to be.

The **Ames Room** (a Quaker oats advert using a very well known false perspective) media type="youtube" key="5ic7QGjGEX8" Inverted face media type="youtube" key="VHooHuhVfsQ" Julian Beever and his alter ego

A Second Hidden Picture within the First
Very much an art form but again interesting in nature

Hidden Face from a Salvador Dali painting lady in mirror
 * //A Pierrot's Love//**

Impossible Objects
Very much a mathematical favorite. Like false perspectives, the use of geometry to convince the eye that something impossible is happening.

An **Escher** favorite. The never ending stairs Impossible Cube media type="youtube" key="rdK68ZwewPI" The Greek Pillars
 * Penrose triangle**