The Cellar - Optical illusion

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- - Optical illusion - images (http://cellar.org/showthread.php?t=9047)

Except that they made big holes in the only patch of shade around. ;)

.. but they created the only shade around.
They can do what they like with it, you long haired pinko hippy. Sheesh!

Mods can delete this if it's too much...but, it is just an arm.

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While I'm at it...

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I had to look at that thrice, Grav!

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from games.yahoo.com

Quote:

Which of the two colored shapes in this illusion is rotating? If you guessed ‘both,’ guess again. Only the outer red ring is actually moving; the blue inner core is stationary. But every time the star-shaped projections on the two objects line up perfectly, the blue shape appears to ‘jerk’ backwards, or counter-clockwise, almost like a gear slotting into place. What causes the illusion? Dutch mathematician and cognitive psychologist Dr. Peter A. van der Helm writes: “[T]he rhombi jump backwards from one wheel notch to the next, and we think the visual system mistakes the wheel notch that opens a background area for the one that shut this background area a moment before. This mistake occurs especially when the wheel has a lower background contrast than the stationary shapes…” In layman’s terms, the brain gets confused by the growing and shrinking gaps between the two shapes, and the strength of the illusion depends on the contrast between their colors. Simple, right? Well, maybe not. But it is nifty. See more about the illusion and its variants here: http://bit.ly/GTRICK

If you scroll down to where you can see only the bottom three points of the blue star, the effect disappears.

Damn you, brain, stop lying to me. I know it isn't moving. Stop that.

from APOD

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Quote:

Explanation: Did this mirage help sink the Titanic? The optical phenomenon called Fata Morgana can make strange shapes or a false wall of water appear above a watery horizon. When conditions are right, light reflecting off of cold water will be bent by an unusual layer of warm air above to arrive at the observer from several different angles. A conceptually comparable mirage can make a setting Sun appear strangely distorted or a distant pavement appear wet. One hundred years ago today, such a Fata Morgana mirage might have obscured real icebergs from the clear view of crew onboard the Titanic. Additional evidence for this distortion hypothesis arises from the nearby vessel SS Californian which reported sightings consistent with Fata Morgana mirages. The above Fata Morgana mirage was taken off the US Pacific coast in 2008.

Wiki link: Fata Morgana

Not really an illusion, but, kinda/sorta.

Don't believe everything you see on tv.

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Quasi-illusion.

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