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Atavachron 
Special Collaborator 
Honorary Collaborator Joined: September 30 2006 Location: Pearland Status: Offline Points: 65290 |
 Posted: June 26 2009 at 21:16 |
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^ basically yes, color is an effect of light (in our case yellow light I guess) hitting a certain surface, no light no color.. as for Friede's spiral, perhaps that purple/orange counter-spiral is contributing to the illusion
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Mr ProgFreak
Forum Senior Member 
Joined: November 08 2008 Location: Sweden Status: Offline Points: 5195 |
Posted: June 27 2009 at 01:37 |
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^ Of course. The parts of the spiral that appear to be blue/green are actually the same (greenish) color, but that color looks much greener to our brain if you put it next to orange bars, as opposed to purple bars. LCDs/CRTs use subtractive RGB color models, and in those orange is composed of red and green, while purple is composed of red and blue. It makes sense ... orange makes the bar next to it look greener compared to purple, which makes the bar next to it more blue.
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harmonium.ro
Special Collaborator
Honorary Collaborator / Retired Admin Joined: August 18 2008 Location: Anna Calvi Status: Offline Points: 22989 |
Posted: June 27 2009 at 08:00 |
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Absence of light => eye perceives black
Perfect environment conditions and light is seen in it's full spectrum => eye perceives white Imperfect environment conditions and light is seen distored, in not full spectrum => eye perceives colour(s)  |
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progkidjoel
Prog Reviewer 
Joined: March 02 2009 Location: Australia Status: Offline Points: 19643 |
Posted: June 27 2009 at 08:19 |
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These are a couple of my favourites:
And 
The graffiti stairs is awesome, IMHO. |
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Slartibartfast
Collaborator
Honorary Collaborator / In Memoriam Joined: April 29 2006 Location: Atlantais Status: Offline Points: 29630 |
Posted: June 27 2009 at 09:04 |
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Great thread, I had some posted in another thread, but I don't remember off the top of my head which thread or where, so instead I offer up these:
Apologies to Michael... I'm not entirely sure if Escher fits into the definition of optical illusion:
Then there's Dali:
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Released date are often when it it impacted you but recorded dates are when it really happened...
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Moogtron III
Prog Reviewer
Joined: April 26 2005 Location: Belgium Status: Offline Points: 10616 |
Posted: June 27 2009 at 09:13 |
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The color examples are amazing, and the moving artwork absolutely stunning.
I can't remember having seen that before.
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Mr ProgFreak
Forum Senior Member
Joined: November 08 2008 Location: Sweden Status: Offline Points: 5195 |
Posted: June 27 2009 at 09:17 |
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I found another one:
 it's obviously caused by the shapes with black edges on one and white edges on the other side. Edited by Mr ProgFreak - June 27 2009 at 09:18 |
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Mr ProgFreak
Forum Senior Member
Joined: November 08 2008 Location: Sweden Status: Offline Points: 5195 |
Posted: June 27 2009 at 09:19 |
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And another one:
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Mr ProgFreak
Forum Senior Member
Joined: November 08 2008 Location: Sweden Status: Offline Points: 5195 |
Posted: June 27 2009 at 09:24 |
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This one is also really nice:
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Moogtron III
Prog Reviewer
Joined: April 26 2005 Location: Belgium Status: Offline Points: 10616 |
Posted: June 27 2009 at 13:44 |
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Mindblowing stuff.
Sometimes it's nice when your brain is playing tricks on you.
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Atavachron
Special Collaborator
Honorary Collaborator Joined: September 30 2006 Location: Pearland Status: Offline Points: 65290 |
Posted: June 27 2009 at 21:29 |
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some remarkable pavement paintings by Julian Beever, keep in mind these are each on a flat 1-dimensioned surface--
http://users.skynet.be/J.Beever/rafting.html http://users.skynet.be/J.Beever/timesquare.html http://users.skynet.be/J.Beever/postmod.htm http://users.skynet.be/J.Beever/coke.html http://users.skynet.be/J.Beever/batman.html http://users.skynet.be/J.Beever/globe.html http://users.skynet.be/J.Beever/arcticwhale.html http://users.skynet.be/J.Beever/treasure5.html http://users.skynet.be/J.Beever/swim.htm http://users.skynet.be/J.Beever/feedfish.html |
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The Quiet One
Prog Reviewer
Joined: January 16 2008 Location: Argentina Status: Offline Points: 15745 |
Posted: June 27 2009 at 22:22 |
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One of my faves:
 Stare at the 4 dots for 20 seconds, and then blink against a wall...... |
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The Quiet One
Prog Reviewer
Joined: January 16 2008 Location: Argentina Status: Offline Points: 15745 |
Posted: June 27 2009 at 22:26 |
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2 more I found:
 How many feet does it have?   |
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martinprog77
Forum Senior Member
Joined: December 31 2005 Location: United States Status: Offline Points: 2523 |
Posted: June 28 2009 at 04:52 |
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Nothing can last
there are no second chances. Never give a day away. Always live for today. |
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martinprog77
Forum Senior Member
Joined: December 31 2005 Location: United States Status: Offline Points: 2523 |
Posted: June 28 2009 at 04:58 |
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Nothing can last
there are no second chances. Never give a day away. Always live for today. |
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BaldJean
Prog Reviewer
Joined: May 28 2005 Location: Germany Status: Offline Points: 10387 |
Posted: June 28 2009 at 09:18 |
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I think the illusion with the dice could be improved; there is a slight giveaway in it. the die on top appears to be a bit smaller than the ones below, which is because it is in reality not on top but further away from the viewer. if you used slightly bigger dice the further they are away from the camera for the photo it would be even more baffling
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 A shot of me as High Priestess of Gaia during our fall festival. Ceterum censeo principiis obsta |
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Failcore
Forum Senior Member
Joined: October 27 2006 Status: Offline Points: 4625 |
Posted: June 28 2009 at 11:21 |
 I didn't believe this one at first b/c I'm almost always able to cancel illusions if I concentrate, but I could not on this one. However, I used the eyedropper to copy the color in photoshop and drew a streak connecting the squares to show they are indeed the same color. Amazing. |
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hitting_singularity2
Forum Senior Member
Joined: June 14 2009 Location: ON, Canada Status: Offline Points: 127 |
Posted: June 29 2009 at 00:54 |
I love these paintings! I've always wanted to see one in real life but never got the chance. It baffles me how they calculate exactly how to distort the picture so it will look that way |
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Atavachron
Special Collaborator
Honorary Collaborator Joined: September 30 2006 Location: Pearland Status: Offline Points: 65290 |
Posted: June 29 2009 at 01:02 |
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^ I think my favorite is Times Square, but the Coke bottle really defies reality
Edited by Atavachron - June 29 2009 at 01:03 |
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Abstrakt
Forum Senior Member
Joined: August 18 2005 Location: Soundgarden Status: Offline Points: 18292 |
Posted: June 29 2009 at 17:20 |
DAMN! That one freaked me out a while back! I saw a Jesus in front of my eyes for MINUTES! It wouldn't go away even if i closed my eyes! |
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The most amazing optical illusion I ever saw!
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Atavachron wrote: