Optical Illusion

Sage · Jul 13, 2005

Stare at the cross in the center.

And if you think it's built into the .gif, open it up in an image editor and see for yourself. It's all science.

Danoff · Jul 13, 2005

That's pretty cool - it looks green.

Max_DC · Jul 13, 2005

👍

Roo · Jul 13, 2005

Surely all the dots should appear if you, say, looked at them and not the cross? And it shouldn't stop rotating if you go to "save image". If it isn't the .gif, then what's the science involved?

kikie · Jul 13, 2005

When I look at that cross, I see a green thing (with a black dot inside) going round, leaving behind a green aura.

Nice 👍

Touring Mars · Jul 13, 2005

He he... very cool.... 👍

Sage · Jul 13, 2005

Well, what I see is a green dot going around, and the red dots eventually disappear.

Famine or Touring Mars or someone more sciency than me can give a better description, but basically you process red and green with the same visual-sensor-processor thingie, and likewise with yellow and blue. When you look at that image, your eyes "get tired" of watching the red, so your eyes switch over to green.

Or something like that.

Famine · Jul 13, 2005

Plus your eyes are rubbish at anything over 3 degrees left-to-right and 1.5 degrees up and down. Better-resolution colour-sensing cones give way to poor-resolution, light-sensing rods.

kikie · Jul 13, 2005

Sage
When you look at that image, your eyes "get tired" of watching the red, so your eyes switch over to green.

Or something like that.

So green is softer, better for your eyes, less tiring???

Iceman · Jul 13, 2005

Very awesome 👍

The red dots disappear altogether for me.

Touring Mars · Jul 13, 2005

If you wait until all you can see is the green dot, and take a screen capture when it hits the top of the circle, and then look at the screen capture, you get this:

I'm assuming because pink and green are complimentary, when the dot disappears, you 'see' the gap as an object the same size and shape as the dot, but in the complimentary colour...

When your brain chooses to focus on the 'moving' object (the gap), it also focuses on the green and therefore disregards the pink...? I'm not at all sure about that, but it must be something like that!

Roo · Jul 13, 2005

Sage
Well, what I see is a green dot going around, and the red dots eventually disappear.

Famine or Touring Mars or someone more sciency than me can give a better description, but basically you process red and green with the same visual-sensor-processor thingie, and likewise with yellow and blue. When you look at that image, your eyes "get tired" of watching the red, so your eyes switch over to green.

Or something like that.

Ahhhhhh. I see. :dunce:

Basically, for all my fellow dunces, stare at the cross for about 10 sceonds and the purple dots will disappear.

Sage · Jul 13, 2005

kikie
So green is softer, better for your eyes, less tiring???

I don't think so I think if you swapped those red dots with green dots, then you'd end up seeing a red dot. "Tired" not specifically because it's red, but just tired of keeping track of a certain color.

DQuaN · Jul 13, 2005

This one is also good. Stare at the blue circles in the middle, and move your head backwards and forwards.

TheCracker · Jul 13, 2005

Thanks for that Sage - now i have a circle of green dots burned into my retinas 👍

Sage · Jul 13, 2005

I've changed the hue to green to see what happens:

Seems like I chose a bad shade of green though it takes a while for the dot to show up, and it's kind of a muddy red. But it still works, just not quite as effectively as the first.

kikie · Jul 13, 2005

Pink, hehe

Touring Mars · Jul 13, 2005

still works...

although strangely, this time it looks more like a clock... and the time it is reading is... beer o'clock! :cheers:

Have a nice night chaps, I'm off to the pub...

Sage · Jul 13, 2005

And blue-to-yellow:

Last one, promise.

Iceman · Jul 13, 2005

Here's a little illusion called a stereogram. These are a bit tricky to get, but try crossing your eyes or moving your eyes very close to the screen and then move them back.

sukerkin · Jul 13, 2005

Ah, visual illusions, one of my favourite distractions from work

.

For those of you whose interest has been whetted by the above, try these sites for more eye-bending, brain-twanging fun:

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

http://psylux.psych.tu-dresden.de/i1/kaw/diverses Material/www.illusionworks.com/

http://www.sandlotscience.com/

amp88 · Jul 13, 2005

Cool. I like the blue to yellow one best

sukerkin · Jul 13, 2005

Nice chameleon, iceman.

Sometimes these 3D images aren't all that sharp or bright but that one is good 👍.

Supren · Jul 13, 2005

Hmm, i can't get that one, i dont nothing phoenominal(hope that's how u spell it)

Sage · Jul 13, 2005

icemanshooter23
Here's a little illusion called a stereogram. These are a bit tricky to get, but try crossing your eyes or moving your eyes very close to the screen and then move them back.

http://www.lri.fr/~marche/images/cameleon-3d.gif

Yup, love those the local newspaper used to carry those in the Sunday funnies, but stopped a few years ago.

I did them for so long that I can get them very easily yes, nice chameleon indeed.

You can even tell that his eye is looking backwards.

Pupik · Jul 14, 2005

The first animated .gif (with pink circles) is cool. They all disappear after awhile.

But I've never seen the "hidden" objects in those stereograms that were so popular in the early '90s. Not once, not ever. I've tried and tried...maybe wearing super-thick, almost bulletproof-lensed glasses doesn't help.

PS · Jul 14, 2005

I stared at the little black cross for a minute, but the pink circles aren't going away. I'm seeing the green dot but why aren't the pink one's leaving? And no, I'm not moving.

Blake · Jul 14, 2005

pupik
The first animated .gif (with pink circles) is cool. They all disappear after awhile.

But I've never seen the "hidden" objects in those stereograms that were so popular in the early '90s. Not once, not ever. I've tried and tried...maybe wearing super-thick, almost bulletproof-lensed glasses doesn't help.

Neither, I've nevr ever ever seen anything in them.

Blake

tabs · Jul 14, 2005

Blake
Neither, I've nevr ever ever seen anything in them.

Blake

You've got to relax your eyes. You know when you're tired and you start seeing 'doubles' ? Do that.

Cool thread! 👍

Sage · Jul 14, 2005

The problem is that it's really hard to explain how to do it if you simply try to cross your eyes (while not looking at your nose), you won't get it. It's just about impossible to explain, but once you get it, it's very easy to lock your eyes in that position (and very easy to do it quickly).

The only thing I can think of mentioning is that when you're cross-eyed, your vision gets blurry; when you do whatever-this-is, you have double-vision, where you have two images of the same thing overlapping each other, with one of the images slightly translucent and blurry and the other fairly clear.

[edit]: Yeah, what tabs said ^

Optical Illusion

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