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f13.net  |  f13.net General Forums  |  General Discussion  |  Topic: I'm blind! 0 Members and 1 Guest are viewing this topic.
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Author Topic: I'm blind!  (Read 3603 times)
Fabricated
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on: October 19, 2005, 09:04:30 PM

Optical Illusions are fun when you're taking a break from playing a game, and don't feel like watching TV or reading news. Great for wasting bandwidth on forums too.

http://www.patmedia.net/marklevinson/cool/cool_illusion.html

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

The top one is especially weird if you can get it to work.

"The world is populated in the main by people who should not exist." - George Bernard Shaw
Stephen Zepp
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Reply #1 on: October 20, 2005, 12:19:40 AM

OK, even though I understand the physics behind that first one, it was extremely eerie to see it in effect!

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Polysorbate80
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Reply #2 on: October 20, 2005, 12:27:15 AM


The top one is especially weird if you can get it to work.

Why wouldn't it work for someone?  After all, the green "dot" is just the after-image from the pink dots.

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Dren
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Reply #3 on: October 20, 2005, 05:50:17 AM

Weird stuff.

It leads me to ask the question,"Who works on stuff like this and figures out how they work?"

You'd have to know a lot about how color and shape is processed by our eyes and mind.
Roac
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Reply #4 on: October 20, 2005, 06:37:45 AM

Why wouldn't it work for someone?  After all, the green "dot" is just the after-image from the pink dots.

No, the creepy part isn't that there's a green dot, it's that all the pink dots dissapear and the *only* thing you see is the green dot.  Which doesn't really exist, while the pink ones do.

-Roac
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Nebu
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Reply #5 on: October 20, 2005, 09:02:55 AM

That was great!  I got it to work pretty quickly and laughed at the effect.  Now I'm trying to convince myself that I understand the physiology of it all.

Thanks for the link.

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Toast
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Reply #6 on: October 20, 2005, 09:13:25 AM

The first one is one of the best illusions I have ever seen. Thanks for sharing.

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jinxer
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Reply #7 on: October 20, 2005, 09:41:51 AM

Wow, I agree with Toast.  That's one of the best ones I've ever seen. It was so cool to watch the pink dots disappear one after the other leaving only the green dot, which really isn't there!  I freaked out my co-workers once again! Thanks Fabricated!  :D

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Margalis
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Reply #8 on: October 20, 2005, 11:11:53 AM

I cna't get the snakes to move. I've seen that before and it worked then..weird. Maybe my brain has evolved.

vampirehipi23: I would enjoy a book written by a monkey and turned into a movie rather than this.
Pococurante
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Reply #9 on: October 20, 2005, 11:19:00 AM

Maybe my brain has evolved.

Or you broke something last time... ;)

Fabricated
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Reply #10 on: October 20, 2005, 03:11:22 PM


The top one is especially weird if you can get it to work.

Why wouldn't it work for someone?  After all, the green "dot" is just the after-image from the pink dots.
I dunno how the brain perceives imagined colors since that green dot doesn't really exist, but the hue of green I see looks like it fits well within the range that a colorblind person couldn't see.

"The world is populated in the main by people who should not exist." - George Bernard Shaw
Alkiera
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Reply #11 on: October 23, 2005, 07:11:32 PM

I can't get all the pink dots to disappear.  Some of them will go away for a bit, but they come back.  Why, I'm not sure.

It may have something to do with variance in vision refresh rates.  I know not all animals have slow enough rates to really see the images on TV, most are fast enough that they see the refresh bars go by and don't get it.  I'd assume a similar variance in humans... Tho I don't have any problems watching TV, I can occasionally detect some choppiness in movies, which have a lower framerate.

Alkiera

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Samwise
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Reply #12 on: October 23, 2005, 09:59:11 PM

The dots will also come back if you move your eyes, even a little bit.  Maybe your eyes are a bit twitchier than most?
Merusk
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Reply #13 on: October 24, 2005, 07:06:07 AM

I can't get all the pink dots to disappear.  Some of them will go away for a bit, but they come back.  Why, I'm not sure.

I had the same problem at first. I just kept gettling my face closer to the screen, and that helped.  I have the 'twitchy eye' problem samwise mentions, and all of the 'focus on' things always screw me because of it.

The past cannot be changed. The future is yet within your power.
Ironwood
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Reply #14 on: October 24, 2005, 07:17:21 AM

I can't get all the pink dots to disappear.  Some of them will go away for a bit, but they come back.  Why, I'm not sure.

Man, you can tell this started as a board about online games.

Nerf those damn dots, I can't get rid of them all...

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Signe
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Reply #15 on: October 24, 2005, 08:41:19 AM

HA HA!  Twitchy Eyes!   tongue

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