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  3. This illusion was new to me.

This illusion was new to me.

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  • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

    This illusion was new to me. Does whichever dot you look at turn more purple?

    Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

    https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

    https://arxiv.org/abs/2509.11582

    rletot@mamot.frR This user is from outside of this forum
    rletot@mamot.frR This user is from outside of this forum
    rletot@mamot.fr
    wrote sidst redigeret af
    #18

    @Danpiker
    Amazing, I feel like my smartphone can track my eyes 😃

    1 Reply Last reply
    0
    • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

      This illusion was new to me. Does whichever dot you look at turn more purple?

      Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

      https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

      https://arxiv.org/abs/2509.11582

      howtophil@mastodon.socialH This user is from outside of this forum
      howtophil@mastodon.socialH This user is from outside of this forum
      howtophil@mastodon.social
      wrote sidst redigeret af
      #19

      @Danpiker It turns... a slightly darker blue, I think?

      1 Reply Last reply
      0
      • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

        This illusion was new to me. Does whichever dot you look at turn more purple?

        Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

        https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

        https://arxiv.org/abs/2509.11582

        cherieherrjones@mastodon.socialC This user is from outside of this forum
        cherieherrjones@mastodon.socialC This user is from outside of this forum
        cherieherrjones@mastodon.social
        wrote sidst redigeret af
        #20

        @Danpiker I definitely see it. Very cool!

        1 Reply Last reply
        0
        • eliocamp@mastodon.socialE eliocamp@mastodon.social

          @PhilSalkie @Danpiker Huh. Does this means that we shouldn't be writing small text or rendering small details in blue?

          philsalkie@mindly.socialP This user is from outside of this forum
          philsalkie@mindly.socialP This user is from outside of this forum
          philsalkie@mindly.social
          wrote sidst redigeret af
          #21

          @eliocamp @Danpiker
          It probably means not just that but we should be compressing the blue layer much more than the green or red when doing lossy compression algorithms.

          1 Reply Last reply
          0
          • mhwombat@mastodon.socialM mhwombat@mastodon.social

            @Danpiker For me, the dot that I'm looking at doesn't change, but the remaining dots fade into the background.

            amosmulder@mastodon.socialA This user is from outside of this forum
            amosmulder@mastodon.socialA This user is from outside of this forum
            amosmulder@mastodon.social
            wrote sidst redigeret af
            #22

            @mhwombat @Danpiker Interesting, I see both effects.

            1 Reply Last reply
            0
            • davidtheeviloverlord@mastodon.socialD davidtheeviloverlord@mastodon.social

              @Danpiker

              Yes. Whichever dot I focus on turns purple.

              clintruin@mastodon.socialC This user is from outside of this forum
              clintruin@mastodon.socialC This user is from outside of this forum
              clintruin@mastodon.social
              wrote sidst redigeret af
              #23

              @davidtheeviloverlord @Danpiker
              Same.

              1 Reply Last reply
              0
              • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                This illusion was new to me. Does whichever dot you look at turn more purple?

                Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                https://arxiv.org/abs/2509.11582

                beckermatic@mastodon.laB This user is from outside of this forum
                beckermatic@mastodon.laB This user is from outside of this forum
                beckermatic@mastodon.la
                wrote sidst redigeret af
                #24

                @Danpiker It also creates a blue trail when I scroll the image up and down. Neat!

                1 Reply Last reply
                0
                • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                  This illusion was new to me. Does whichever dot you look at turn more purple?

                  Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                  https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                  https://arxiv.org/abs/2509.11582

                  axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                  axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                  axel_hartmann@digitalcourage.social
                  wrote sidst redigeret af
                  #25

                  @Danpiker - where to use?
                  guest bathroom wallpaper or <insert evil laughter> tablecloth

                  axel_hartmann@digitalcourage.socialA 1 Reply Last reply
                  0
                  • axel_hartmann@digitalcourage.socialA axel_hartmann@digitalcourage.social

                    @Danpiker - where to use?
                    guest bathroom wallpaper or <insert evil laughter> tablecloth

                    axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                    axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                    axel_hartmann@digitalcourage.social
                    wrote sidst redigeret af
                    #26

                    @Danpiker or: legal texts

                    1 Reply Last reply
                    0
                    • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                      This illusion was new to me. Does whichever dot you look at turn more purple?

                      Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                      https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                      https://arxiv.org/abs/2509.11582

                      bytebro@mastodonapp.ukB This user is from outside of this forum
                      bytebro@mastodonapp.ukB This user is from outside of this forum
                      bytebro@mastodonapp.uk
                      wrote sidst redigeret af
                      #27

                      @Danpiker

                      Doesn't seem to 'work' for me. I have no colour blindness of which I'm aware!

                      1 Reply Last reply
                      0
                      • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                        This illusion was new to me. Does whichever dot you look at turn more purple?

                        Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                        https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                        https://arxiv.org/abs/2509.11582

                        itgrrl@infosec.exchangeI This user is from outside of this forum
                        itgrrl@infosec.exchangeI This user is from outside of this forum
                        itgrrl@infosec.exchange
                        wrote sidst redigeret af
                        #28

                        @Danpiker

                        a #ProTip for those playing along at home – if you have “night shift” (iOS) or “eye comfort” (Android) on you’ll probably need to turn it off to see the effect, otherwise all the dots will just look purple 💁‍♀️

                        truenorthspice@mastodon.worldT 1 Reply Last reply
                        0
                        • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                          This illusion was new to me. Does whichever dot you look at turn more purple?

                          Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                          https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                          https://arxiv.org/abs/2509.11582

                          dsandler@mastodon.socialD This user is from outside of this forum
                          dsandler@mastodon.socialD This user is from outside of this forum
                          dsandler@mastodon.social
                          wrote sidst redigeret af
                          #29

                          @Danpiker what's fascinating about this is that, as someone with deuteranomaly, _none_ of the dots is obviously purple for me, on any background. they all seem "blue, but if you told me they're actually purple, I would believe you", which is just really common for me.

                          that must mean that the amount of short-wavelength sensitivity loss in the fixated area is not enough to offset the confusion (and overall lower information content) of overlapping long/medium wavelength response?

                          1 Reply Last reply
                          0
                          • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                            This illusion was new to me. Does whichever dot you look at turn more purple?

                            Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                            https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                            https://arxiv.org/abs/2509.11582

                            wcbdata@vis.socialW This user is from outside of this forum
                            wcbdata@vis.socialW This user is from outside of this forum
                            wcbdata@vis.social
                            wrote sidst redigeret af
                            #30

                            @Danpiker TIL (from someone who said "this doesn't really work") - this doesn't work if your phone has a blue-light-blocking filter on it!

                            crazyeddie@mastodon.socialC 1 Reply Last reply
                            0
                            • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                              This illusion was new to me. Does whichever dot you look at turn more purple?

                              Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                              https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                              https://arxiv.org/abs/2509.11582

                              darkoptimism@mstdn.socialD This user is from outside of this forum
                              darkoptimism@mstdn.socialD This user is from outside of this forum
                              darkoptimism@mstdn.social
                              wrote sidst redigeret af
                              #31

                              @Danpiker
                              Nothing happens for me

                              1 Reply Last reply
                              0
                              • conchoid@mastodon.gamedev.placeC conchoid@mastodon.gamedev.place

                                @Danpiker i don't see it

                                crazyeddie@mastodon.socialC This user is from outside of this forum
                                crazyeddie@mastodon.socialC This user is from outside of this forum
                                crazyeddie@mastodon.social
                                wrote sidst redigeret af
                                #32

                                @conchoid @Danpiker I had to work pretty hard at it.

                                I had to open the many dots image alone and zoom in. Then if I stare at a dot really hard it does appear to be ever so slightly darker a purple than the rest.

                                My eyes hurt now and everything is blurry. Don't do this at home.

                                1 Reply Last reply
                                0
                                • forteller@tutoteket.noF forteller@tutoteket.no

                                  @Danpiker This is trippy as hell! I also feel like the border is more distinct when it's purple, but I can't really check because they all turn purple when I look at them! 🤯

                                  forteller@tutoteket.noF This user is from outside of this forum
                                  forteller@tutoteket.noF This user is from outside of this forum
                                  forteller@tutoteket.no
                                  wrote sidst redigeret af
                                  #33

                                  @Danpiker OK, so now, looking at it on my phone, they're all purple! And the one I look at is only slightly darker purple. Wild stuff. 😅

                                  1 Reply Last reply
                                  0
                                  • wcbdata@vis.socialW wcbdata@vis.social

                                    @Danpiker TIL (from someone who said "this doesn't really work") - this doesn't work if your phone has a blue-light-blocking filter on it!

                                    crazyeddie@mastodon.socialC This user is from outside of this forum
                                    crazyeddie@mastodon.socialC This user is from outside of this forum
                                    crazyeddie@mastodon.social
                                    wrote sidst redigeret af
                                    #34

                                    @wcbdata @Danpiker Using a laptop. Yoga 910. Quick duck search leads me to believe there's no such filter on its screen. My night light shift software isn't on.

                                    vOv

                                    solitha@mastodon.socialS 1 Reply Last reply
                                    0
                                    • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                      This illusion was new to me. Does whichever dot you look at turn more purple?

                                      Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                      https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                      https://arxiv.org/abs/2509.11582

                                      mstr_milktea@blorbo.socialM This user is from outside of this forum
                                      mstr_milktea@blorbo.socialM This user is from outside of this forum
                                      mstr_milktea@blorbo.social
                                      wrote sidst redigeret af
                                      #35

                                      @Danpiker

                                      Didnt see it until I put my phone back a lil further from my face. Cool!

                                      1 Reply Last reply
                                      0
                                      • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                        This illusion was new to me. Does whichever dot you look at turn more purple?

                                        Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                        https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                        https://arxiv.org/abs/2509.11582

                                        pierre_pebble@mastodon.ieP This user is from outside of this forum
                                        pierre_pebble@mastodon.ieP This user is from outside of this forum
                                        pierre_pebble@mastodon.ie
                                        wrote sidst redigeret af
                                        #36

                                        @Danpiker this is absolutely wild! It definitely works for me

                                        1 Reply Last reply
                                        0
                                        • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                          This illusion was new to me. Does whichever dot you look at turn more purple?

                                          Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                          https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                          https://arxiv.org/abs/2509.11582

                                          johncomic@beige.partyJ This user is from outside of this forum
                                          johncomic@beige.partyJ This user is from outside of this forum
                                          johncomic@beige.party
                                          wrote sidst redigeret af
                                          #37

                                          @Danpiker not really seeing it #MaybeThatsJustMe

                                          1 Reply Last reply
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