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 Post subject: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 8:58 pm 
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as what the title says. let us exercise our eyes on these optical illusions :shock: 8)
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An optical illusion is always characterized by visually perceived images that, at least in common sense terms, are deceptive or misleading. Therefore, the information gathered by the eye is processed by the brain to give, on the face of it, a percept that does not tally with a physical measurement of the stimulus source. This is a list of amazing illusions.




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Leaning Tower Illusion

The two images above are identical, yet the tower on the right appears to be leaning more steeply. The reason for this is because the visual system treats the two images as if part of a single scene. Normally, if two adjacent towers rise at the same angle, their image outlines converge as they recede from view due to perspective, and this is taken into account by the visual system.

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Last edited by Ukyo on Sun Aug 01, 2010 9:13 pm, edited 2 times in total.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:01 pm 
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Color Perception

Believe it or not – the pink spots in the image above are the same – if you don’t believe me, open the image in photoshop and compare them.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:02 pm 
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Instant Gratification

This one works immediately – stare at the dot in the center of the image and move your head back and forth – the rings will rotate.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:02 pm 
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Straight Lines

The image above is composed entirely of straight lines. If you don’t believe, try using a ruler to test it.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:03 pm 
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Believe it or not

This one is amazing – the blue and green lines in the picture above are the same color.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:09 pm 
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Sacred Heart Illusion

Click here http://listverse.files.wordpress.com/2007/12/aparicion.0.jpg to open it as its full size then slowly move your head away from the image.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:10 pm 
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Moving Squares

Move your eyes around the image above and the squares will appear to rotate.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:11 pm 
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Monster Magic

In the image above, the two monsters are the same size.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:15 pm 
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Blivet

A blivet, also known as a poiuyt, is an undecipherable figure, an optical illusion and an impossible object. It appears to have three cylindrical prongs at one end which then mysteriously transform into two rectangular prongs at the other end.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:16 pm 
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Bezold Effect

The Bezold Effect is an optical illusion, named after a German professor of meteorology, Wilhelm von Bezold (1837-1907), who discovered that a color may appear different depending on its relation to adjacent colors. In the above example, the red seems lighter combined with the white, and darker combined with the black.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:26 pm 
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Café Wall Illusion

The café wall illusion is an optical illusion, first described by Doctor Richard Gregory. He observed this curious effect in the tiles of the wall of a café at the bottom of St Michael’s Hill, Bristol. This optical illusion makes the parallel straight horizontal lines appear to be bent. To construct the illusion, alternating light and dark “bricks” are laid in staggered rows. It is essential for the illusion that each “brick” is surrounded by a layer of “mortar” (the grey in the image). This should ideally be of a color in between the dark and light color of the “bricks”.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:28 pm 
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The Chubb Illusion

The Chubb illusion is an optical illusion wherein the apparent contrast of an object varies dramatically, depending on the context of the presentation. Low-contrast texture surrounded by a uniform field appears to have higher contrast than when it is surrounded by high-contrast texture. This was observed and documented by Chubb and colleagues in 1989.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:42 pm 
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Ebbinghaus Illusion

The Ebbinghaus illusion is an optical illusion of relative size perception. In the best-known version of the illusion, two circles of identical size are placed near to each other and one is surrounded by large circles while the other is surrounded by small circles; the first central circle then appears smaller than the second central circle.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:45 pm 
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Fraser Spiral Illusion

The illusion is also known as the false spiral, or by its original name, the twisted cord illusion. The overlapping black arc segments appear to form a spiral; however, the arcs are a series of concentric circles.

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 Post subject: Re: OPTICAL ILLUSIONS
PostPosted: Sun Aug 01, 2010 9:47 pm 
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Hermann Grid Illusion

The Hermann grid illusion is an optical illusion reported by Ludimar Hermann in 1870 while, incidentally, reading John Tyndall’s Sound. The illusion is characterised by “ghostlike” grey blobs perceived at the intersections of a white (or light-colored) grid on a black background. The grey blobs disappear when looking directly at an intersection.

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