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RAV TUX
February 8th, 2007, 09:12 AM
If your eyes follow the movement of the rotating pink dot, you will only see one color, pink.
If you stare at the black + in the center, the moving dot turns to green.
Now, concentrate on the black + in the center of the picture. After a short period of time,
all the pink dots will slowly disappear, and you will only see a green dot rotating
http://img110.imageshack.us/img110/9728/image4yzpu6.gif

slimdog360
February 8th, 2007, 09:18 AM
thats because the one moving is green, plus the frequency of the movement is such that aliasing occurs.

viper
February 8th, 2007, 09:52 AM
thats because the one moving is green, plus the frequency of the movement is such that aliasing occurs.

What a spoil sport !!!!
I thought it was REAL magic :)

slimdog360
February 8th, 2007, 10:00 AM
MUAHAHAHAHAHA. I want to change my name to funkill

RAV TUX
February 8th, 2007, 10:51 AM
MUAHAHAHAHAHA. I want to change my name to funkill

slimdog-funkill360

bikeboy
February 8th, 2007, 11:05 AM
thats because the one moving is green...

Is it now? It appears that way in full motion, but try taking a few screenshots of it.

RAV TUX
February 8th, 2007, 11:08 AM
Is it now? It appears that way in full motion, but try taking a few screenshots of it.could you post your screenshots?

Sepp1
February 8th, 2007, 12:10 PM
Gee. Thanks a bunch. My eyes feel like they´re 2cm. out of my skull now. :)

bikeboy
February 8th, 2007, 12:19 PM
I didn't save them...But I'll do it again.

Every one I try turns out that way so I'm pretty sure they aren't green. It must be the transition that makes it appear green when in motion.

manmower
February 8th, 2007, 12:26 PM
Looks to me like a demonstration of perceptual filling in + apparent motion. Nicely done though, the filling in (what makes the dots disappear when you fixate ) is usually not that strong in other demonstrations. Screen resolution and viewing distance play a great role in the effect too. The visual angle between the fixation cross and the dots is crucial to the effect. So if you can't get it to "work" try sitting closer to / further from your screen.

The green colour IMHO is the result of blending between the pink colour and the grey that appears when the dot shortly disappears.

EdThaSlayer
February 8th, 2007, 03:06 PM
Neat trick. I never knew the eye could be so easily tricked.

antenna
February 8th, 2007, 03:17 PM
In a somewhat similar vein, I like this (http://www.johnsadowski.com/big_spanish_castle.php) one.

Eddie Wilson
February 8th, 2007, 03:22 PM
These are GREAT! Anybody got any more?
Eddie

dorcssa
February 8th, 2007, 03:24 PM
In a somewhat similar vein, I like this (http://www.johnsadowski.com/big_spanish_castle.php) one.

This one doesn't work for me..maybe I can't concentrate enough.

fuscia
February 8th, 2007, 03:24 PM
looks like butterfly, to me.

manmower
February 8th, 2007, 03:34 PM
In a somewhat similar vein, I like this (http://www.johnsadowski.com/big_spanish_castle.php) one.

Nice one!

ljpm
February 8th, 2007, 03:51 PM
Neat trick. I never knew the eye could be so easily tricked.

Have 3 or 4 beers on a Friday night and see how easily your eyes are tricked. :lolflag:

mcduck
February 8th, 2007, 09:59 PM
This one doesn't work for me..maybe I can't concentrate enough.
;)

The first one is real though. The green you see is the complementary color for the pink used in the dots, and is caused by the way your eye and brains work together.

If you stare at the cross for a while these colors will then override each other, and you'll see all pink dots disappear leaving only the green spot going around the cross.

dorcssa
February 8th, 2007, 10:26 PM
I thought the complementer color of purple is yellow, with green goes red and with blue goes orange. Someone said in this thread I think, that the gray and the purple make the green together.

mcduck
February 8th, 2007, 10:40 PM
I thought the complementer color of purple is yellow, with green goes red and with blue goes orange. Someone said in this thread I think, that the gray and the purple make the green together.
That is rather pink than purple, but to be sure I checked the colors with Agave:

Brunellus
February 8th, 2007, 10:50 PM
tricky. Wonder when this effect will make it into Beryl.

ComplexNumber
February 8th, 2007, 10:51 PM
i love all these visual illusions. my favourite must be the one that has the steps that constantly go up, but never actually go anywhere.

here are some more visual illusions, including the ones by that guy who draws visual illusions in town/citry centres:
http://thrillingwonder.blogspot.com/2006/10/optical-illusions-extravaganza.html
http://www.birkoph.com/illusions.php
http://www.moillusions.com/
http://cvcl.mit.edu/hybridimage.htm

RAV TUX
February 9th, 2007, 01:26 AM
tricky. Wonder when this effect will make it into Beryl.

As soon as I figure out how to set a animated gif as my wallpaper:)

ComplexNumber
February 9th, 2007, 02:20 AM
As soon as I figure out how to set a animated gif as my wallpaper:)
isn't xearth an example of animated wallpaper?

RAV TUX
February 9th, 2007, 04:02 AM
isn't xearth an example of animated wallpaper?
xearth?

ComplexNumber
February 9th, 2007, 04:09 AM
xearth?
yeah, its in the repos. i was going to downloaded and install it to show you, but it requires a downgrade of gnome (ie it wanted to remove gnome) to instal it, so i didn't bother. its quite an old package, and is basically a spinning animated globe that acts as wallpaper.
just did some googling - this (http://www.netadmintools.com/nimages/xearthgenback.png) is xearth:

RAV TUX
February 9th, 2007, 04:15 AM
yeah, its in the repos. i was going to downloaded and install it to show you, but it requires a downgrade of gnome (ie it wanted to remove gnome) to instal it, so i didn't bother. its quite an old package, and is basically a spinning animated globe that acts as wallpaper.
just did some googling - this (http://www.netadmintools.com/nimages/xearthgenback.png) is xearth:
Thanks emerging now:popcorn::popcorn::popcorn::popcorn::popcorn:

RAV TUX
February 9th, 2007, 04:16 AM
Thanks emerging now:popcorn::popcorn::popcorn::popcorn::popcorn:
done!:popcorn::popcorn::popcorn:

ComplexNumber
February 9th, 2007, 04:24 AM
emerging
oooooooah, i see. hmmmm gentoo.

so what are your thoughts about it so far?

RAV TUX
February 9th, 2007, 05:52 AM
oooooooah, i see. hmmmm gentoo.

so what are your thoughts about it so far?

I have fallen for emerge....love it.:popcorn::popcorn::popcorn::popcorn::popcorn:

ComplexNumber
February 9th, 2007, 06:15 AM
I have fallen for emerge....love it.:popcorn::popcorn::popcorn::popcorn::popcorn:
i meant about xearth, not gentoo or emerge :mrgreen:

RAV TUX
February 9th, 2007, 06:36 AM
i meant about xearth, not gentoo or emerge :mrgreen:oh I emerged and got distracted...how do I activate it?

ComplexNumber
February 9th, 2007, 04:54 PM
oh I emerged and got distracted...how do I activate it?
as far as i remember, if it doesn't show up in the menu then just type 'xearth' into the terminal. i think its often used as a screensaver too.

newbie2
February 10th, 2007, 04:11 PM
These are GREAT! Anybody got any more?
Eddie

type in google search : visual illusion
there is lots of them ;)