[HN Gopher] Akiyoshi's Illusion Pages
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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]
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(page generated 2023-09-15 23:00 UTC)