Perceptual Illusions (2018)
nautil.us
Perceptual Illusions (2018)
1–10 of 35 posts
Re: Perceptual Illusions (2018)
#2Very nice collection. All the illusions are due to natural intelligence in the days of artificial intelligence. Brainpower is always a mystery to me.
Re: Perceptual Illusions (2018)
#3> 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.
Re: Perceptual Illusions (2018)
#4> 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 perce…
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.
Re: Perceptual Illusions (2018)
#5> 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 perce…
>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...
Re: Perceptual Illusions (2018)
#6Wow, 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
Re: Perceptual Illusions (2018)
#7Number 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.
Re: Perceptual Illusions (2018)
#8Check 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
Re: Perceptual Illusions (2018)
#9Wow, 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
That's why eye witnesses aren't as reliable as one might think
Re: Perceptual Illusions (2018)
#10One 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.)