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Old 03-06-2010, 10:34 PM   #1
Javed
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Optical Illusions / Unusual Images


As you look at these dice, try to determine if they are standing up, or laying flat.





Is the devil near?


(an eclipse of the Sun in May 2003, photographed near Vienna/Austria.Photo taken by P. Wienerroither )









Below, look at the gap as it moves around the pink circles,
now stare at the cross and what colour does the gap appear?








At first glance, this looks like a wooded landscape, with towering hills in the background.
However look a little more closely and you will see that the trees are broccoli and the hills are baked potatoes. In fact everything you can see in the photograph is made of food!

















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Old 03-07-2010, 06:07 AM   #2
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http://www.maniacworld.com/Spinning-...l-Illusion.gif

Which way is she turning?
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Old 03-07-2010, 07:18 AM   #3
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Checker Shadow Illusion

http://web.mit.edu/persci/people/ade..._illusion.html
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Old 03-07-2010, 07:40 AM   #4
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I played around and made a video out of that picture. Let me see if I can figure out how to post it on my website, and if I can, I'll post a link. At 17.49 MB, it's too large to upload here.
Last edited by WT Sharpe; 03-07-2010 at 08:27 AM.
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Old 03-07-2010, 07:46 AM   #5
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I played around and made a video out of that picture. Let me see if I can figure out how to post it on my website, and if I can, I'll post a link. At 17.49 MB, it's too large to upload here.
Here you go:

http://wtsharpe.com/Videos/Optical%2...%20001%20e.mov
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Old 03-07-2010, 08:13 AM   #6
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The silhouette itself could be turning in either direction. However, if it's turning to the right, then we're looking at the silhouette from above and can see the shadow on the ground, even if the ground is invisible. However, the shadow is rendered in a way consistent with us looking from below the floor at silhouette turning to the left. Unfortunately, then we'd see no shadow - so the picture makes no sense either way.
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Old 03-07-2010, 08:17 AM   #7
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Good job WT!
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Old 03-07-2010, 08:21 AM   #8
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Thanks, Sparrow!

It needs more "hang time" at the beginning and maybe a soundtrack. Maybe one day when I'm feeling ambitious.
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Old 03-07-2010, 09:33 AM   #9
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Quote:
Originally Posted by Krystian Galaj View Post
The silhouette itself could be turning in either direction. However, if it's turning to the right, then we're looking at the silhouette from above and can see the shadow on the ground, even if the ground is invisible. However, the shadow is rendered in a way consistent with us looking from below the floor at silhouette turning to the left. Unfortunately, then we'd see no shadow - so the picture makes no sense either way.
It's an illusion - it's not rotating at all, being a two dimensional image. The point is that we can perceive it to be rotating clockwise or anti-clockwise and this appears to be bi-stable - it seems to just flip between the two possibilities, though having disambiguated to the image to be moving in one direction it is sometimes quite difficult to "get it" to go in the opposite direction.
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Old 03-07-2010, 07:14 PM   #10
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It's an illusion - it's not rotating at all, being a two dimensional image. The point is that we can perceive it to be rotating clockwise or anti-clockwise and this appears to be bi-stable - it seems to just flip between the two possibilities, though having disambiguated to the image to be moving in one direction it is sometimes quite difficult to "get it" to go in the opposite direction.
TGS, this illusion is really clever and amazing! The first time I looked, it seemed to be turning clockwise and I couldn't perceive it to go in the other direction. I had another look at it and then she was going anti-clockwise! Great! It does become difficult to get her to change direction. I found looking more to the left or right helped me to perceive the rotational shift, and then I could look straight at the image again and the rotation had changed. Thanks for posting this illusion!
~ ~ ~ ~ ~ ~ ~

Sparrow, the Checker Shadow Illusion is very clever too, thanks! When I first saw it, I thought there was no way they were the same color. They are though! Thanks Tom, for the great video of this showing how they are the same color.
~ ~ ~ ~ ~ ~ ~



~ ~ ~ ~ ~ ~ ~

In this linked image, "Rotating Snake Illusion", the strong rotation occurs in relation to eye movements. On very steady and precise eye fixation the effect vanishes.
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Old 03-07-2010, 07:20 PM   #11
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In this linked image, "Rotating Snake Illusion", the strong rotation occurs in relation to eye movements. On very steady and precise eye fixation the effect vanishes.
The only way I can get the snakes to stay still is squint and defocus my eyes slightly. Otherwise no matter how still I think I'm keeping them, there's at least one, usually more, moving.

Repeated experimenting with this has led me to conclude I have a headache...
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Old 03-11-2010, 10:07 AM   #12
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It's an illusion - it's not rotating at all, being a two dimensional image. The point is that we can perceive it to be rotating clockwise or anti-clockwise and this appears to be bi-stable - it seems to just flip between the two possibilities, though having disambiguated to the image to be moving in one direction it is sometimes quite difficult to "get it" to go in the opposite direction.
Well, not for my mind. To me, it's always spinning clockwise, and though I can understand how it should look if it was spinning anti-clockwise, I can't make my mind see it as such. Only clockwise.
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Old 03-11-2010, 03:16 PM   #13
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Well, not for my mind. To me, it's always spinning clockwise, and though I can understand how it should look if it was spinning anti-clockwise, I can't make my mind see it as such. Only clockwise.
You are obviously in your right mind, sir.

Most days, I'm not.
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Old 03-11-2010, 03:54 PM   #14
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If I look off to the side it helps me see the illusion spin the other way.
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Old 03-11-2010, 03:59 PM   #15
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If I look off to the side it helps me see the illusion spin the other way.
Yes, that helps me too. Another way is to just look at the lower edge of the picture at the shadow and not the silhouette; that also works for me. Sometimes I can do it easily, othertimes it is very hard to change the spin.
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