# A nifty optical illusion, pink dots that turn green. **URL:** \ **Category:** Miscellaneous and Personal Stuff I Must Share\ **Created:** [October 22, 2005, 7:21am UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408 "2005-10-22T07:21:00Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![FinnAgain](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/finnagain/32/12500_2.png) [@FinnAgain](https://boards.straightdope.com/u/FinnAgain)\ **Post date:** [October 22, 2005, 7:21am UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/1 "2005-10-22T07:21:00Z")
[A very, very, neat trick.](http://www.patmedia.net/marklevinson/cool/cool_illusion.html) Nothing much to add to it… as it’s rather, well, mundane and pointless. But I must share it! Hope y’all enjoy. ---
**Author:** ![nivlac](https://avatars.discourse-cdn.com/v4/letter/n/3bc359/32.png) [@nivlac](https://boards.straightdope.com/u/nivlac)\ **Post date:** [October 22, 2005, 7:40am UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/2 "2005-10-22T07:40:54Z")
Really cool! Thanks for sharing. ---
**Author:** ![KJ](https://avatars.discourse-cdn.com/v4/letter/k/b2d939/32.png) [@KJ](https://boards.straightdope.com/u/KJ)\ **Post date:** [October 22, 2005, 8:56am UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/3 "2005-10-22T08:56:51Z")
Wow. That’s now one of my favorite optical illusions. It’s interesting to pay attention to which dots disappear; at first I could only see the dots on the bottom, and with each rotation one dot on each side disappeared. At one point, all of the dots disappeared but as the “green” dot rotated around, they came back again, one at a time, like they were being erased and then redrawn. Spooky. I’m going to show this to all my friends! ---
**Author:** ![Anastasaeon](https://avatars.discourse-cdn.com/v4/letter/a/73ab20/32.png) [@Anastasaeon](https://boards.straightdope.com/u/Anastasaeon)\ **Post date:** [October 22, 2005, 12:17pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/4 "2005-10-22T12:17:22Z")
Ooooooh, I like that one. I’m also fond of [this one](http://www.grand-illusions.com/angryandsmiles.htm). This is the kind of thing that keeps me off of drugs. 😃 ---
**Author:** ![Revtim](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/revtim/32/1042_2.png) [@Revtim](https://boards.straightdope.com/u/Revtim)\ **Post date:** [October 22, 2005, 12:30pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/5 "2005-10-22T12:30:36Z")
These illusions demonstrate that our brain has bugs, or perhaps design flaws. Maybe the next version will some of these kinks worked out. ---
**Author:** ![Bear\_Nenno](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bear_nenno/32/3358_2.png) [@Bear\_Nenno](https://boards.straightdope.com/u/Bear_Nenno)\ **Post date:** [October 22, 2005, 12:32pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/6 "2005-10-22T12:32:26Z")
How the fuck does that work?? ---
**Author:** ![Digital\_Stimulus](https://avatars.discourse-cdn.com/v4/letter/d/aeb1de/32.png) [@Digital\_Stimulus](https://boards.straightdope.com/u/Digital_Stimulus)\ **Post date:** [October 22, 2005, 2:03pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/7 "2005-10-22T14:03:08Z")
> [@Bear\_Nenno](#): > > How the fuck does that work?? I believe it’s due to persistence of vision. For me, the dots fade until and unless I blink, in which case they “reappear”. Nifty. ---
**Author:** ![klintypooh](https://avatars.discourse-cdn.com/v4/letter/k/3da27b/32.png) [@klintypooh](https://boards.straightdope.com/u/klintypooh)\ **Post date:** [October 22, 2005, 3:21pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/8 "2005-10-22T15:21:37Z")
Finn, you visit ColegeHumor? ---
**Author:** ![badbadrubberpiggy](https://avatars.discourse-cdn.com/v4/letter/b/57b2e6/32.png) [@badbadrubberpiggy](https://boards.straightdope.com/u/badbadrubberpiggy)\ **Post date:** [October 22, 2005, 3:22pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/9 "2005-10-22T15:22:09Z")
Not all the pink dots disappeared for me, but I did get a nifty illusion where a pink dot was “chasing” the green dot around the circle. I think I looked away too soon. ---
**Author:** ![Electronic\_Chaos](https://avatars.discourse-cdn.com/v4/letter/e/bbe5ce/32.png) [@Electronic\_Chaos](https://boards.straightdope.com/u/Electronic_Chaos)\ **Post date:** [October 22, 2005, 4:20pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/10 "2005-10-22T16:20:34Z")
You think that’s weird? Try [this](http://research.lumeta.com/ches/me/). Two days later, and I still see the effect (it’s jut very vague). ---
**Author:** ![Kythereia](https://avatars.discourse-cdn.com/v4/letter/k/e8c25b/32.png) [@Kythereia](https://boards.straightdope.com/u/Kythereia)\ **Post date:** [October 22, 2005, 4:21pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/11 "2005-10-22T16:21:38Z")
That’s so cool! ---
**Author:** ![anyrose](https://avatars.discourse-cdn.com/v4/letter/a/54ee81/32.png) [@anyrose](https://boards.straightdope.com/u/anyrose)\ **Post date:** [October 22, 2005, 4:56pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/12 "2005-10-22T16:56:51Z")
gee thanks everyone for those 3 cool links and for the after images causing me to retype every word in this post 3 times to correct the spelling errors caused by thick black horizontal and verticle lines all over mmy keyboard 😉 😃 ---
**Author:** ![Electronic\_Chaos](https://avatars.discourse-cdn.com/v4/letter/e/bbe5ce/32.png) [@Electronic\_Chaos](https://boards.straightdope.com/u/Electronic_Chaos)\ **Post date:** [October 22, 2005, 5:23pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/13 "2005-10-22T17:23:39Z")
> [@anyrose](#): > > gee thanks everyone for those 3 cool links > > and for the after images causing me to retype every word in this post 3 times to correct the spelling errors caused by thick black horizontal and verticle lines all over mmy keyboard 😉 😃 The after images go away. But still the illusion persists. Quite odd. ---
**Author:** ![FinnAgain](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/finnagain/32/12500_2.png) [@FinnAgain](https://boards.straightdope.com/u/FinnAgain)\ **Post date:** [October 22, 2005, 6:50pm UTC](https://boards.straightdope.com/t/a-nifty-optical-illusion-pink-dots-that-turn-green/327408/14 "2005-10-22T18:50:10Z")
> [@klintypooh](#): > > Finn, you visit ColegeHumor? Truth be told, I’m not even sure what that is.