[HN Gopher] Mind-Bending Perceptual Illusions (2018)
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Mind-Bending Perceptual Illusions (2018)
Author : robertwiblin
Score : 73 points
Date : 2021-08-25 19:04 UTC (3 hours ago)
(HTM) web link (nautil.us)
(TXT) w3m dump (nautil.us)
| cymon wrote:
| Number 12 is quite something, it works with anything you look at
| after staring the center of the top image. I looked at my food
| and I could see it moving in a very odd manner, went back to
| image for 15 seconds and looked at the walls, same effect and
| repeated the same with other stuff and after 10 minutes I feel
| motion sickness like the one you get after spinning and losing
| your balance (not everyone gets this I think)
| gpas wrote:
| It's amazing how well it reproduces how some psychedelics warp
| vision. Those act on the brain, this tricks the eyes, similar
| result.
|
| I experience something similar while cycling on trails. If I
| watch only the road rolling under me for some time and then
| look at some static object, like a big cloud, it appears to
| move towards me (or away, can't remember right now).
| the_arun wrote:
| Very nice collection. All the illusions are due to natural
| intelligence in the days of artificial intelligence. Brainpower
| is always a mystery to me.
| cwkoss wrote:
| I wonder how many of these illusions work in 3D. Might have to
| take a crack at modelling the rice wave illusion or the cafe wall
| illusion for 3d printing.
| causality0 wrote:
| Number 8 has not been created correctly. The line segments
| actually are being lengthened and shortened because the black
| segments overlap part of the colored line when they're convex and
| do not when they're concave. You can see this if you lay the tip
| of your mouse pointer over them.
| dredmorbius wrote:
| One of may favourite instances of an optical illusion ever is
| this short video of a cat pouncing on a sheet of paper on which
| shows an apparent-motions spirals illusion.
|
| https://yewtu.be/watch?v=S4IHB3qK1KU
|
| It reveals that at least _this_ aspect of feline and human visual
| perception appears to be similar.
|
| As a means of getting inside a cat's head, it's never failed to
| fascinate me.
|
| There's another ... _perceptual phenomenon_ is probably a better
| description than _illusion_ ... contained in an episode of the
| You Are Not So Smart podcast. In it, a short snippet of noise is
| played. It sounds completely random. After a cue is heard ... the
| noise resolves to a comprehensible message.
|
| In my case, I'd started listening to the podcast whilst falling
| asleep. I don't recall consciously hearing the cue ... but ...
| when I replayed the podcast the next day, _I could understand the
| audio clip on the first play_. I 'd "crossed over to the other
| side* without even consciously hearing the cue.
|
| (I've looked for the episode in the archives listing. I cannot
| find it though I think it may turn up.)
|
| https://youarenotsosmart.com/all-posts/
| tobr wrote:
| > 3. Confetti
|
| > The illusion is a vivid demonstration of the fact that we don't
| directly perceive the colors of objects in the world. Instead,
| the perceptual system takes an educated "guess," based on the
| objects' surroundings.
|
| I disagree. E.g. the circles overlapped with green and blue lines
| look greenish to me, and the circles overlapped with purple and
| blue look pinkish. If the apparent difference was due to
| perceiving the lines as a neutral surrounding, the effect should
| be the opposite: a circle overlapped with green should come
| across as _less_ green, not more.
|
| I'm pretty sure the effect just comes from half-toning.
| carl_dr wrote:
| Agreed, I experience exactly the same, and is the weakest
| (read: most easily understood) example shown.
|
| The others are all very good, I really like that I can
| understand why I am perceiving them the why I do, but despite
| of that can't "fix" that perception.
| croes wrote:
| >If the apparent difference was due to perceiving the lines as
| a neutral surrounding
|
| That's not how it works.
|
| https://www.livescience.com/confetti-munker-white-optical-il...
|
| Another example
|
| https://www.sciencealert.com/crazy-optical-illusion-makes-yo...
| matsemann wrote:
| Check out http://illusionoftheyear.com/
|
| It's a yearly contest with people coming up with various stuff.
| Normally one finds Kokichi Sugihara in the top. I'm a big fan of
| him after meeting him at a conference (FUN With Algorithms), and
| made my own attempts on some of his concepts:
| https://github.com/Matsemann/impossible-objects
| codeulike wrote:
| https://github.com/Matsemann/impossible-objects
|
| holy crap those gifs with the mirror are completely doing my
| head in
| JabavuAdams wrote:
| Wow, that means we really can't trust our eyes / senses for a lot
| of things! Some people should figure out a way for us to figure
| out what's true or not, even though we can't see what's true or
| not. /sarcasm
| dylan604 wrote:
| That's why eye witnesses aren't as reliable as one might think
| niccl wrote:
| I've often wondered if there are perceptual illusions for blind
| people: Maybe a physical cafe wall would feel like the rows
| weren't parallel.
| john579 wrote:
| I seem to be immune from most of these illusions. I am not color
| blind and both my eyes can see fine. It must be something inside
| my head that's different. I have to read the explanation to
| understand what other people are seeing.
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