[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)
 
web link (journalofillusion.net)
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)