Another sweet optical illusion
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Thread: Another sweet optical illusion

  1. #1
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    Another sweet optical illusion

    I know there have been several threads for these in the past, but I don't remember coming across this one in any of them:
    http://www.patmedia.net/marklevinson..._illusion.html

    enjoy!

    -Rob

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    that was entirely too cool, and too distracting.
    so..if there are no pink dots and no green dots, then what the hell am i looking at?

    rethought:
    theres a zone that we cannot see. I dont know the exact name for it, nor the dimensions, but its a spot where neither cone of sight can get good perifreal [sp] details and the brain kinda makes it up. Think of it like the brain whipping out the heal tool and patching the zone you cant see. POINT BEING. I think this illusion is pretty much sapping off of that, putting them dots roughly at the spot we cant see. By animating it so that at any given time, one spot isnt there, our brains will "heal" that spot into the grey, as opposed to the pink, because there is much more grey than pink. and the green dot mess is just the shock difference of there being pink one second, and grey the next.
    good find mang.

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    i love optical illusions but thats is one of the coolest i have seen.
    thanks

    tensai


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    Advocate

    When you stare at one colour spot very long, the receptors in your eye for that colour get "tired" and can't see it. Then when that colour spot is removed you see the colour of that spot minus the pink so you see the complement, in this case green.

    So the pink spots are always there, there is no green dot though, just the temporary abscence of pink.

    Look at the pink dots for a while then quickly look to the side and you will see a whole ring of green dots- the afterimage burned into your eyes for a second.

    Hope that made sense.
    Craig

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    Very cool. Thanks for this

    The sketchbook thread!

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    Whaa. Thanks.

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    way cool

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    that... is so damned cool.

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    Wow, that's a good optical illusion, one of the best I've seen. Watching the pink dots actually randomly pop away one by one as you stare at the center is weird.

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    Hmm, after image? The green is the complement to those pinks right? It's burned into our eyes, there is no green just gray coving up the pink? ... Why does it disappear though?

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    The best part of it is having the pink dots disappear one by one. I dunno if its the same for everyone else but I saw it like that.

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    Quote Originally Posted by Idiot Apathy
    Hmm, after image? The green is the complement to those pinks right? It's burned into our eyes, there is no green just gray coving up the pink? ... Why does it disappear though?
    stare at the sun, and then close your eyes or look at a white wall. you'll understand.

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  13. #13
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    very nice illusion!

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    When all of the pink dots dissapeared I actually said "woah" out loud. That was crazy!

    "Every generation sees the past though the lens of its own time." - Thom Hartmann
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    A great illustration of coloured afterimages, and also of how what we see is, as always, a reconstruction of what is out there rather than a direct, perfect copy.

    Saving the gif file and opening it in photoshop I got for the grey background
    R 178 G 178 B 178
    and for the middle of the pink dots
    R 254 G 20 B 254

    Your monitor is designed so that these R, G and B phosphors each stimulates one of your three cone types more than the other two. For convenience rather than strict accuracy I'll call these the red-sensitive, green-sensitive and blue-sensitive cones.

    The green dots are afterimages produced by the pheomenon of adaptation, the same process that allows your eyes to adjust to the dark or to bright light, by adjusting the sensitivity of the receptor cells. The pink light strongly stimulates your red and blue-sensitive receptors, but not your green sensitive receptors. At each spot on your retina exposed to the pink light, the red- and blue- sensitive receptors become relatively less sensitized, and the green-sensitive receptors relatively more sensitized (as if they were adapted to a darkened room). So, as Craig D says, your eye "tires" of the pink light, and when the pink suddenly changes to grey, or when your eye drifts around the image, your eye interprets the sudden strong stimulation of the green-sensitive receptors and reduced stimulation of the others as a green light.

    Adaptation makes the apparent intensity of the pink dots diminish as we look at them, but would not make them disappear entirely. The disappearance I think relates to the way our vision "fills in" colour information into areas largely detected by other parts of the visual system. Two things that help the pink dots to disappear are
    1. they have very soft edges, and
    2. they are about the same tone as the grey field.
    This makes them invisible to the edge-detecting and tone-detecting parts of our visual system. It seems that once the colour-deyecting system becomes partially adapted to the pink colour, it is no longer called on to fill in the colour of an area that other parts of the system don't even detect. The system is still alerted by the sudden CHANGE of stimulus, though, which I think is the reason why we do still see the (illusory) green dots.

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    wierd

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    that's a cool illusion. but imo this is way cooler
    supetkickassillusion

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    holy crap mr point... thats the coolest thing ever
    at the risk of sounding like a hippy, that was trippy

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  20. #20
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    Woah, neat! Thanks for sharing

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    Just like...... woah...
    ~Lover~

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  22. #22
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    That was really damn cool Mr. Point.


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    anyone else notice the red blinking cursor?

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  24. #24
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    Yeah, ... just a glitch I think.

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