[HN Gopher] Double-mirror illusion
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Double-mirror illusion
Author : weird_user
Score : 87 points
Date : 2023-12-15 15:17 UTC (7 hours ago)
(HTM) web link (journalofillusion.net)
(TXT) w3m dump (journalofillusion.net)
| n3storm wrote:
| I clicked with the illusion to see and illusion. Now this is a
| double disillusion.
| fredre338 wrote:
| On the top right, click on "Figures". I almost had the same
| reaction.
| troyvit wrote:
| I am now illusioned!
| n3storm wrote:
| me too! thank you all!
| akovaski wrote:
| Also, if you're on mobile, switch to the "Desktop site" mode of
| your browser. I wasn't able to see the figures without setting
| this.
| kordlessagain wrote:
| The page on mobile makes me think this an allusion.
| weird_user wrote:
| Better URL:
|
| https://journalofillusion.net/index.php/joi/article/view/983...
| throwaway092323 wrote:
| This feels like a J-class SCP
| hoherd wrote:
| That is awesome. I can't wait to see the STL files people make so
| we can all print them up!
|
| Meanwhile, here is a single mirror illusion STL file and a video
| showing off how similar illusions work
| https://www.thingiverse.com/thing:1970522 You can play with the
| STL in 3D and get a bit of an idea of how it works.
| weird_user wrote:
| I think you misunderstood this. This is not an illusion of
| objects from different angles, but an unintuitive
| transformation of geometry.
| MattRix wrote:
| They didn't misunderstand. If you look at the images included
| in the paper (this link has them inline: https://journalofill
| usion.net/index.php/joi/article/view/983...) you can see that
| it is an illusion that can be created with 3D printed
| objects.
| jameshart wrote:
| The linked STL is a different Kokichi Sugihara illusion - by
| the same creator as this new class of illusions, and part of
| a body of work in this field that this appears to be a
| continuation of.
|
| https://en.wikipedia.org/wiki/Kokichi_Sugihara
| codeflo wrote:
| But it is. Those are objects that are mirror symmetric, and
| the apparent direction they're facing depends on viewing
| angle, creating the illusion that they haven't actually been
| mirrored.
| codeflo wrote:
| For anyone who's confused about where to find the images: Click
| "Figures" in the sidebar on the right.
|
| For anyone who's confused about how this works: The objects
| aren't what they appear to be from _any_ angle. In fact, they 're
| weird mirror symmetric objects that bend backwards in ways you
| wouldn't expect. It's our shape recognition that makes them look
| flatter than they are. This also makes them look like asymmetric
| objects that are facing a certain direction depending on the
| viewing angle, and _this_ is the actual illusion.
|
| It's sad that we don't get a 360 degree view, or even a couple of
| rotations of one of these, because that would make it obvious
| that the object goes from "proper shape" to "unrecognizable
| shape" to "flipped shape" depending on angle.
|
| Anyway, when viewed in the mirror from certain angles, first of
| all the object doesn't change (because it's mirror symmetric).
| But because you view the mirror image from a different angle, it
| looks as if it's facing the other direction.
| ImHereToVote wrote:
| What sidebar? I don't see a sidebar. When I click the figures
| the site just hijacks my browser history.
|
| I think it's about time companies hire the mentally challenged
| to be front-end devs. I commend the site for breaking new
| ground in equity.
| LelouBil wrote:
| If I force desktop view on mobile the sidebar appears
| thih9 wrote:
| Rotating phone to landscape worked for me.
|
| Desktop mode showed me the same content on my device.
| tobr wrote:
| You need to hold your phone up to a mirror to see it.
| thih9 wrote:
| This page presents Sugihara's earlier work and provides 360
| degree view:
|
| https://www.sciencebuddies.org/science-fair-projects/project...
| Anotheroneagain wrote:
| I suppose it only works on camera. I can't imagine it works in
| person.
| gowld wrote:
| It works only from the forced perspective angle. If you move
| the camera, the image morphs.
| PBnFlash wrote:
| This seems like a version of the ambiguous cylinder illusion
| https://youtu.be/yupxceBjDa0
| pests wrote:
| I am illusioned right now.
|
| Are these special objects? Which figures in the article are thoe
| being displayed in?
|
| To me, each example basically "works" if you pretend its not a
| mirror corner but just a solid mirror at an angle. I'm guessing
| this is not the intent though?
| matsemann wrote:
| I've implemented some of Sugihara's work earlier. Downloadable
| files for 3d printing and examples I've shared here:
| https://github.com/Matsemann/impossible-objects
| dmitrybrant wrote:
| Please, for the love of god, stop with the custom scroll bars,
| and on the wrong side of the viewport, no less!
| kulahan wrote:
| Yeah, this might be one of the worst websites I've seen. This
| is really unenjoyable to navigate.
| SamBam wrote:
| The apparent failure to mirror "correctly" left and right in this
| illusion reminds me of a great interview question I heard: why
| does a mirror reverse things left and right, but not flip them
| top and bottom?
|
| It can be fun to watch people scratch their head over it.
| stevage wrote:
| On mobile, not only did I not get to see the images, I couldn't
| even leave the site by pressing back. On both chrome and FF on
| Android.
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(page generated 2023-12-15 23:00 UTC)