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 Post subject: Optical illusions
PostPosted: Mon Oct 03, 2005 10:12 pm 
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Here's one:

Image

Examine the squares with an RGB colour checker. They really are the exact same shade of grey!

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 Post subject: Optical illusions
PostPosted: Mon Oct 03, 2005 10:25 pm 
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a k a LightningMan, lover of bountiful pulchritude

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That is too cool.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 12:36 am 
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I love this kinda stuff. Like the image that looks like three bars of colour that are each going from dark to light - except that the middle bar is actually the same colour the whole way through.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 1:05 am 
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That is amazing.


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 10:07 am 
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As dull and repetitive as they are

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I'm not buying it...

Why, when I cover the green entirely, does B not appear darker?


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 10:29 am 
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a k a LightningMan, lover of bountiful pulchritude

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I'm sure it has to do with how the mind processes information from the eyes (why B doesnt appear darker to you, but if you have Paint Shop Pro or Photoshop or the like, you can prove it to yourself.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 11:29 am 
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As dull and repetitive as they are

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Yes, I'm sure the color checker will confirm they are the same. But for an illusion that is dependent on the the green cylinder to affect how the eye views the squares, the absence of said cylinder should revert the squares to the same color.


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 11:50 am 
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How does

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It's still comparing with the darker squares, which also got darker due to the shadow falling across them and that lighter gray square.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 12:02 pm 
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a k a LightningMan, lover of bountiful pulchritude

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It's not the green cylinder that causes the problem. It's the shadow and the persistence of the checkerboard pattern in your mind.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 12:49 pm 
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As dull and repetitive as they are

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When I cut out two little squares and lay the paper over the checkerboard, they're still different colors.


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 1:08 pm 
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a k a LightningMan, lover of bountiful pulchritude

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I don't know what you're doing, John, but they just aren't different colors. Here are A and B cropped right around the letter (for the best effect, as the squares RGB value varies as it heads toward the edges).


You do not have the required permissions to view the files attached to this post.

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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 1:15 pm 
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As dull and repetitive as they are

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Thanks, James


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 5:44 pm 
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It isn't the green that throws you. The change in the surrounding squares is what really makes the difference.

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Great optical!


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 Post subject: Optical illusions
PostPosted: Tue Oct 04, 2005 5:55 pm 
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not to mention the change in colours of the letters 'a' and 'b' - that is throwing you as well :)

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 Post subject: Optical illusions
PostPosted: Wed Oct 05, 2005 3:58 pm 
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What do you call a camel with three humps?

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There's a whole bunch more at this site:

http://www.echalk.co.uk/amusements/Opti ... ption.html


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 Post subject: Optical illusions
PostPosted: Thu Oct 06, 2005 8:14 am 
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How does

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Obviously, the problem was in the gray matter used.

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Wow... I made it into the top 20 posters. I sure talk alot.

(or as my shop teacher used to say...)

McConnell, you have diarrhea of the mouth and constipation of the brain.

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 Post subject: Optical illusions
PostPosted: Sat Oct 22, 2005 9:55 pm 
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Three-time WWF Intercontinental title holder

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http://www.patmedia.net/marklevinson/co ... usion.html


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 Post subject: Optical illusions
PostPosted: Sat Oct 22, 2005 10:08 pm 
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Freaky!


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 Post subject: Optical illusions
PostPosted: Sat Oct 22, 2005 10:17 pm 
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How does

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I think that one works much the same way as staring at a US Flag, and then looking elsewhere and seeing a flag colored green, black and orange.

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 Post subject: Optical illusions
PostPosted: Sun Oct 23, 2005 2:19 am 
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King of Goth

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Ow! My eyes! The burning!

Cool :)

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 Post subject: Optical illusions
PostPosted: Sun Oct 23, 2005 8:08 am 
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:: insert clever title here ::

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Cool...

Time to bring the kids over and have them amazed!


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 Post subject: Optical illusions
PostPosted: Sun Oct 23, 2005 11:48 am 
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Neat-o!

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