TRICKERY!!!!

[He Man]

I couldnt believe it myself until i photoshoped it, but then i found out exactly what he did to get that effect. I wont spoil it, but if you want to know PM me. because its pretty stupid, but cool.

[GAAN]

Why does the illusion work?



The visual system needs to determine the color of objects in the world. In this case the problem is to determine the gray shade of the checks on the floor. Just measuring the light coming from a surface (the luminance) is not enough: a cast shadow will dim a surface, so that a white surface in shadow may be reflecting less light than a black surface in full light. The visual system uses several tricks to determine where the shadows are and how to compensate for them, in order to determine the shade of gray "paint" that belongs to the surface.

The first trick is based on local contrast. In shadow or not, a check that is lighter than its neighboring checks is probably lighter than average, and vice versa. In the figure, the light check in shadow is surrounded by darker checks. Thus, even though the check is physically dark, it is light when compared to its neighbors. The dark checks outside the shadow, conversely, are surrounded by lighter checks, so they look dark by comparison.

A second trick is based on the fact that shadows often have soft edges, while paint boundaries (like the checks) often have sharp edges. The visual system tends to ignore gradual changes in light level, so that it can determine the color of the surfaces without being misled by shadows. In this figure, the shadow looks like a shadow, both because it is IZ_ and because the shadow casting object is visible.

The "paintness" of the checks is aided by the form of the "X-junctions" formed by 4 abutting checks. This type of junction is usually a signal that all the edges should be interpreted as changes in surface color rather than in terms of shadows or lighting.

As with many so-called illusions, this effect really demonstrates the success rather than the failure of the visual system. The visual system is not very good at being a physical light meter, but that is not its purpose. The important task is to break the image information down into meaningful components, and thereby perceive the nature of the objects in view.

[teddy037.2]

it is too early for that much science

[GAAN]

it is too early for that much science

after finding that explaination

I got pissed and went to bed

my own eyes lied to me

[El Matador]

after finding that explaination

I got pissed and went to bed

my own eyes lied to me

I've stopped getting pissed about that, my eyes used to do that to me every time I went out. it's called beer goggles

[Duck-Stew]

What my eyes tell me, I believe.  If I begin to doubt them with TRICKERY like this...what's next?  Mid corner line corrections on my favorite twisties?!?

Hog-wash I say...  The green column is the darkest cuz it's Friday, and I'm havin' some  for dinner.


Now git off'n-a mai-lawn!!!!

[redxblack]

which if deployed in certain areas can lead to yet another kind of trickery.

[He Man]

Is that nixon in a drag?

[GAAN]

which if deployed in certain areas can lead to yet another kind of trickery.

Trannies were invented by Anheuser-Busch in the late eighties to test the effectivness of beer goggles

and of course

The damn things escaped