[HN Gopher] Sugihara's Dog
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       Sugihara's Dog
        
       Author : sohkamyung
       Score  : 219 points
       Date   : 2023-04-04 09:35 UTC (13 hours ago)
        
 (HTM) web link (twitter.com)
 (TXT) w3m dump (twitter.com)
        
       | hammock wrote:
       | Is there a place to buy these? Or download the plans and
       | somewhere that will print them for you?
        
         | CobrastanJorji wrote:
         | Here's a star/heart that's the same idea:
         | https://www.myminifactory.com/object/3d-print-ambiguous-star...
         | 
         | I've printed it and physically fiddling with it made it much
         | more clear how it worked.
         | 
         | I haven't seen a print for that dog, though.
         | 
         | In theory, I think you could use Sugihara's approach to
         | automatically generate such a model for most closed curves.
         | That'd be a cool little program that I don't know how to write.
        
       | avpix wrote:
       | This is a fantastic demonstration of a pseudovector!
       | https://en.wikipedia.org/wiki/Pseudovector
        
         | [deleted]
        
       | dark-star wrote:
       | His illusions are awesome. Even if you know how they work (watch
       | his videos), your brain will still not be able to completely
       | comprehend them.
       | 
       | That's what makes a good optical illusion.
        
         | coldpie wrote:
         | It took me an embarrassingly long time to even realize what the
         | illusion _was_.
        
           | [deleted]
        
           | chillbill wrote:
           | I didn't even see that there was a mirror
        
           | DMell wrote:
           | I still don't. Can someone explain?
        
             | Hamuko wrote:
             | How do objects normally appear when viewed in a mirror?
        
               | DMell wrote:
               | Okay - wow..
        
               | 0xbadcafebee wrote:
               | [dead]
        
               | IIAOPSW wrote:
               | reflected
        
             | lm28469 wrote:
             | The dog appears to be facing the same way, even in the
             | reflection
        
             | [deleted]
        
             | too_damn_fast wrote:
             | Is it supposed to be the shiba inu image that replaced the
             | Twitter Bird?
        
         | BelleOfTheBall wrote:
         | Searching on YouTube doesn't seem to bring anything about the
         | one linked here, am I putting in the wrong term? I'd love to
         | know how this was done, it's messing with my head.
        
           | paulette449 wrote:
           | Ambiguous Cylinders 1 & 2 by Sugihara:
           | 
           | https://www.youtube.com/watch?v=SzC-pV_moFc
           | 
           | https://www.youtube.com/watch?v=NxspLn-B8DE
        
             | SynasterBeiter wrote:
             | This guy took inspiration from him and is 3D printing more
             | variations on these illusions.
             | 
             | https://www.youtube.com/watch?v=22x4aALI0VE
        
               | BelleOfTheBall wrote:
               | Oh, this is really interesting, he goes into detail on
               | how difficult it can be to print them, too, based on the
               | fact that you have to make the parts moveable and a lot
               | of them are somewhat small, too. Thank you!
        
           | bejd wrote:
           | From finding his name in the Twitter comments, his channel
           | seems to be https://www.youtube.com/@kokichisugihara3277
        
       | IIAOPSW wrote:
       | Remember folks, if you're unsure, illusions don't have shadows.
        
       | js2 wrote:
       | If you, like me, are one of today's lucky ten thousand[1], here's
       | some context:
       | 
       | Kokichi Suhihara is an engineering professor who designs 3D
       | objects that create optical illusions, including their mirrored
       | images. Here's his English home page:
       | 
       | http://www.isc.meiji.ac.jp/~kokichis/Welcomee.html
       | 
       | So we're looking at a photo of an actual 3D object and its
       | mirrored reflection, which should obviously appear incorrect
       | since, well, the reflection is not apparently mirrored but rather
       | facing the same way as the real object. I think the key to
       | understanding what we're seeing is that the non-mirrored image is
       | also not as it appears. We'd need to see it rotated to understand
       | the actual shape.
       | 
       | Here's a short YouTube video of his "Ambiguous Garage Roof" that
       | I've now watched several times and it keeps blowing my mind:
       | 
       | https://youtu.be/KtA6u1HIqbg
       | 
       | [1] https://xkcd.com/1053/
        
         | the_af wrote:
         | > _Here 's a short YouTube video of his "Ambiguous Garage Roof"
         | that I've now watched several times and it keeps blowing my
         | mind:_
         | 
         | > https://youtu.be/KtA6u1HIqbg
         | 
         | What the...
         | 
         | What's amazing about the Ambiguous Garage is that even after
         | I've seen how the illusion is done, my brain keeps getting
         | fooled. It's one of those things where it's simply impossible
         | not to "see" the illusion even after you understand it.
        
           | js2 wrote:
           | It reminds me of the Penn and Teller red ball routine where
           | they tell you how it works before they perform it and your
           | brain (well, mine anyway) still won't accept it.
           | 
           | https://youtu.be/W2T-YUd_Om4
           | 
           | https://www.thisamericanlife.org/extras/the-floating-ball-
           | ro...
        
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       (page generated 2023-04-04 23:01 UTC)