[HN Gopher] Akiyoshi's Illusion Pages ___________________________________________________________________ Akiyoshi's Illusion Pages Author : robin_reala Score : 288 points Date : 2023-09-15 12:43 UTC (10 hours ago) (HTM) web link (www.ritsumei.ac.jp) (TXT) w3m dump (www.ritsumei.ac.jp) | xwdv wrote: | I wonder if any 8-bit era games used these kinds of illusions to | simulate advanced shader effects. | tempaway75751 wrote: | The most mind blowing optical illusion I've seen are Kokichi | Sugihara's Ambiguous Objects: | | https://www.youtube.com/watch?v=KtA6u1HIqbg | nojs wrote: | A similar one that I like, and you can easily make yourself: | | https://www.moillusions.com/dragon-illusion/ | catbird wrote: | That was a fun little project. It looks even better in | person! | alberto_ol wrote: | Previous submissions, only the older ones have comments | | https://hn.algolia.com/?q=Akiyoshi%E2%80%99s+Illusion+Pages+... | ayx wrote: | I can never see these illusions :/ Only the bulge works. Movement | I can't see at all. | | Am I supposed to look at it a certain way? I tried at different | distances. I've tried using larger screens. Nothing.. | pvg wrote: | A lot of the movement ones are more noticeable with actual | movement so scrolling a little bit could help. I notice them | popping more when I scroll through his twitter feed. | grilledchickenw wrote: | The second black hole one "Approaching black hole: yesterday" is | stunning. I cannot believe it's a still image. | http://www.psy.ritsumei.ac.jp/~akitaoka/saishin69e.html | Solvency wrote: | Am I alone in not understanding this black hole one... it's a | sequence of three obviously distinct still images in which the | black center is larger than the previous image. | | Meanwhile, each image on its own is offering no kind of | perceptive illusion to me... | kazinator wrote: | I don't intuitively understand any illusion. I don't have | conscious introspection into what the layers of neurons are | doing between the retina and conscious visual perception. The | layers of neurons use certain indirect cues in order to | detect size, depth and movement. Those cues do their job in | most circumstances, but test cases can be constructed which | falsely trigger those cues. That's just an intellectual | generality that doesn't explain anything specific. | btilly wrote: | You should add shadow to the list of important cues. | Something light in shadow can be the same color as | something white in direct light. You can see that optical | illusion in | https://en.wikipedia.org/wiki/Checker_shadow_illusion. | | My favorite example of where shadow matters is "the dress". | As https://slate.com/technology/2017/04/heres-why-people- | saw-th... explains, those whose brains assumed it was in | shadow saw it as white and gold. Those whose brains thought | it was in light saw it as blue and black. (It was actually | a blue and black dress, in light. But the photo was taken | in such a way that most people thought it was in shadow.) | tstrimple wrote: | For me it doesn't seem to grow. But the blurred edges | definitely show movement from my perception with both eyes | open. If I close one eye the effect goes away altogether. | gowld wrote: | The intent is that the black hole grows while you stare at | it. | | Not all illusions work on everyone in every environment. | block_dagger wrote: | Staring at any of them individually makes the central circle | appear to grow. Bottom one is most effective for my eyes. | Creepy! | notsahil wrote: | Akiyoshi's twitter also has cool illusions: | | - https://twitter.com/AkiyoshiKitaoka | | - https://nitter.net/AkiyoshiKitaoka | bhtru wrote: | Nitter is dead no? | pbhjpbhj wrote: | It worked for me. | willmeyers wrote: | Can these affect your vision (long-term) if you stare at them for | too long? I feel like many of these images produce similar | effects to the McCollough effect. | https://en.wikipedia.org/wiki/McCollough_effect | JKCalhoun wrote: | When I was young (maybe 8 or so?) my mom got me a book of B&W | moire patterns. It consisted of a book of B&W patterns and a | clear plastic sheet also with similar patterns. When you | overlaid the plastic sheet over the patterns in the book is | when you got the moire patterns. | | Besides seeing yellows and other _fringe colors_ appear from | the moire, I always wondered if the patterns were linked to | ocular migraines I would have for some decades after. | | (Edit: yeah, this book: https://www.goodreads.com/book/show/244 | 6119.Optical_Designs_...) | rqtwteye wrote: | I could imagine that it will change the way you perceive | things. There are experiments where people got goggles that | switched the left and right eyes and people adjusted after a | few days. | david422 wrote: | That's pretty wild. | davchana wrote: | Or even simple glasses which turn the view upside down. Human | eyes were able to adjust itself (or the image) correct way | after few hours. | d-lisp wrote: | I had a copy of some Merleau-Ponty work in which this | experiment was commented, IIRC the experimenter did really | think his brain was damaged when the world appeared upside | down to him without the glasses. | joshspankit wrote: | This is an interesting question and one that we're possibly | just on the leading edge of being able to ask correctly. | | The answers are likely to be varied and along multiple axis: | | - Do they affect the muscles of the eye, especially the ones | that affect the lens | | - Do they affect the rods/cones (and do they equally affect | people with genetic differences) | | - Do they affect the way the signals are sent to the brain | | - Do they affect the visual cortex itself | | and | | - Do they affect the brain's processing of visual input in some | way | | In my personal experience, I'd say we'd need to look at someone | for a minimum of 3 years, and ideally 5 or more. | dr_dshiv wrote: | My mind is blown. | | I wonder whether the "Rauschenberg Illusion" would count. Named | after Robert Rauschenberg's blank white canvases which show that | big white fields are filled with illusions of color and form from | our visual system. (Or at least, they are for me. I'm not nuts, | am I?) | dang wrote: | Related: | | _Akiyoshi 's Illusion Pages_ - | https://news.ycombinator.com/item?id=25785081 - Jan 2021 (17 | comments) | | _Akiyoshi 's Illusion Pages_ - | https://news.ycombinator.com/item?id=13793715 - March 2017 (32 | comments) | | _Akiyoshi 's illusion pages_ - | https://news.ycombinator.com/item?id=5697783 - May 2013 (15 | comments) | moritzwarhier wrote: | I was really happy about the first one, "spontaneously", | including the quotes, this is such an apt description! | | Alas, for me it seems to occur mostly on eye movement/focus | change.. which happens to happen... spontaneously | fny wrote: | Are there rules for creating these illusions? | guyomes wrote: | Mark Changizi had an interesting insight on how some illusions | work [1]. | | What we see is a reconstruction by the brain interpolated from | our sensors. The idea of Mark is that the image is not only an | interpolation of the present, but actually also an | extrapolation of what the image will be in the next tenth of a | second. For tasks such as catching a ball, this would allow us | to compensate for the delay of the signal between our brain and | our muscles. | | Based on this idea, he wrote a classification of many illusions | [2]. | | [1]: https://www.livescience.com/4950-key-optical-illusions- | disco... | | [2]: | https://onlinelibrary.wiley.com/doi/full/10.1080/03640210802... | gowld wrote: | > Caution, continued | | > Some of the pictures on this website can cause dizziness or | might possibly epileptic seizures. The latter happens when the | brain can't handle the conflicting information from your two | eyes. If you start feeling unwell when using this website, | immediately cover one eye with your hand and then leave the page. | Do not close your eyes because that can make the attack worse. | 3seashells wrote: | Persistent Visual cortex defects. Now imagine the brain riddled | with similar defects, when it's comes to reasoning and learning. | If there was one creature not defect, the whole rest of the zoo | would be sad. | lisper wrote: | It's possible to create "impossible" shapes in real life: | | https://flownet.com/ron/trips/Europe2023/pause/206.html | gowld wrote: | 2D projections of 3D impossible shapes, yes. | kazinator wrote: | Some of the movement illusions really pop out if you slowly move | your finger across the image and track it with your eyes. Or use | a mouse pointer similarly if you're on desktop. | ceddec wrote: | A lot of graphic illusions are used commercially e.g for product | advertising like here: https://www.shapeshiftermedia.com | joshu wrote: | He posts regularly here: https://twitter.com/AkiyoshiKitaoka | aimor wrote: | This one almost hurts, forget the approaching black hole I get | dazzling speckles of white light. : | http://www.psy.ritsumei.ac.jp/~akitaoka/Plaid-tunnel02-040-b... | btilly wrote: | I used to have a high quality printout of the rotating snakes | illusion by my desk. | | I had people who refused to be at my desk because it creeped them | out that they absolutely knew the paper couldn't be moving, but | their brains kept seeing the snakes rotate. | thanatos519 wrote: | What a great filter that must be! | susam wrote: | One of Akiyoshi Kitaoka's recent work that I found absolutely | stunning is the following illusion where a ring of one colour | appears to be either in front of or behind two rings of another | colour: | | https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... | | https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... | | To my perception, the blue ring appears to float above the red | rings. It feels a bit like an autostereogram where a | 3-dimensional image emerges out of a 2-dimensional image. | However, there is no autostereogram in this image and there is no | crossing of eyes involved. The 3-dimensional image arises out of | an otherwise plain image of differently coloured rings on a dark | background. | | An analysis of this illusion is available here: | http://www.psy.ritsumei.ac.jp/~akitaoka/Kitaoka2015_Referenc... | magic_hamster wrote: | That's a very cool illusion. First time I see it. I wonder if | the color patterns on the different rings have something to do | with it. | TeaDude wrote: | I'm very shocked that these were only discovered so recently | (Well. If you consider the early 2000's to be "recent". I'd have | assumed that we'd have found these out earlier) | | I suppose that's why they were all the rage in childrens' books | and museums around that time. | [deleted] ___________________________________________________________________ (page generated 2023-09-15 23:00 UTC)