Does anyone else like optical illusions?

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Dembadon
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http://www.michaelbach.de/ot/

I just spent the last 45 minutes looking at some of the demonstrations on that site. Apart from sore eyes and a minor headache, I find it fascinating. Most of the demonstrations allow you to manipulate sliders to adjust different aspects of the illusion. Some of them seemed bogus: telling me things were or weren't moving when I swore otherwise. I wouldn't know how to go about proving any shenanigans, though.

Anyway, does anyone else like optical illusions? If so, what are some of your favorites?
 
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  • #2
256bits
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Good catch.
I have seen a lot of them previously.

The new ones for me were the blurring ie the angry face and the Lincoln pictures.
Never used to understand what squinting ever did for sight improvement - now I know.
 
  • #3
Dembadon
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Good catch.
I have seen a lot of them previously.

The new ones for me were the blurring ie the angry face and the Lincoln pictures.
Never used to understand what squinting ever did for sight improvement - now I know.
I'd only seen a few of them before. One of my favorites was the "Breathing Square." It looked like the square was getting bigger, but that's only because our initial view is limited by the slits.
 
  • #4
Andy Resnick
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http://www.michaelbach.de/ot/

I just spent the last 45 minutes looking at some of the demonstrations on that site. Apart from sore eyes and a minor headache, I find it fascinating. Most of the demonstrations allow you to manipulate sliders to adjust different aspects of the illusion. Some of them seemed bogus: telling me things were or weren't moving when I swore otherwise. I wouldn't know how to go about proving any shenanigans, though.

Anyway, does anyone else like optical illusions? If so, what are some of your favorites?
Here's another page:

http://www.ritsumei.ac.jp/~akitaoka/index-e.html
 
  • #6
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Is there a measure of how effective an optical illusion is?
 
  • #7
FlexGunship
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Is there a measure of how effective an optical illusion is?
Yes, it's called the "dude, come look at this" and it's units are "WTF?"
 
  • #8
Pythagorean
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Is there a measure of how effective an optical illusion is?
You can certainly measure the effect on the individual compared to other individuals within a single illusion (http://ripplestat.com/dnlds/task_directions/ml_directions.pdf" [Broken]) given that that some properties of the illusion can be quantified.

If you were to do this with several different illusions, you might be able to see which illusion fooled more people in a given sample, but I don't think there's some standard measure established; External validity is a huge problem with this complex of a system. Mapping mind to brain is one of the big projects going on in the scientific community right now, so there could very well be some paper/s on your very question for all I know. There's lots of papers (some very speculative) on the subject of subjectiveness.
 
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Pythagorean
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https://www.youtube.com/watch?v=Ttd0YjXF0no
 
  • #10
Evo
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I loved the "magic eye" books.

Here is one. Just touch your nose to the screen and slowly pull away without focusing, once you see the 3D image, you can focus on it. Doing it on the computer is so much easier than the book!

http://www.magiceye.com/
 
  • #11
Dembadon
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I loved the "magic eye" books.

Here is one. Just touch your nose to the screen and slowly pull away without focusing, once you see the 3D image, you can focus on it. Doing it on the computer is so much easier than the book!

http://www.magiceye.com/
I like them as well. I was never able to get it to work with the method you mention, though. The only way is works for me is to "defocus" my eyes and kind-of stare through the page for a few seconds. When I refocus them, I can usually see the embedded image. Putting my nose on the page and pulling it away never really worked as well, even though the focus/defocus component is the same for each.
 
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Magic-eye is better than drugs.
 

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