The demonstrations given by this lecturer are more refined so it is easier to observe how magenta arises in proximity to other colours. https://www.youtube.com/watch?v=PqZ1THDGD34
The idea that real or objective colour is reducible to a single parameter known as wavelength seems to me simplistic and wrong. Even with the domain of the hard sciences, colour should be treated as a multidimensional phenomena. Harry On Tue, Aug 15, 2023 at 10:16 PM H L V <hveeder...@gmail.com> wrote: > Cool. Your story got me to watch videos of stress visualization in plastic > using polarized light. > Noticing how readily the colour magenta (a.k.a. pink ) is produced in > this video as the plastic is rotated. > https://www.youtube.com/watch?v=-6U4uembaNQ > > Watching how the magenta patches come and go as the viewing angle changes > got me thinking about the common teaching that since magenta > does not appear in Newton's spectrum it is made up by the brain whenever > red and blue light overlap. (By contrast magenta does appear in Goethe's > spectrum a.k.a the dark spectrum). > > Although it is certainly possible to trick the brain into seeing colours > which aren't there such as when red and green light overlap to create the > illusion of yellow light, this is not proof that magenta is just made up by > the brain. On the contrary if magenta were just made up by the brain then > _every_ instance of magenta in the above video should show signs of red and > blue around its perimeter which is not the case. > > Harry > > > On Mon, Aug 14, 2023 at 5:16 PM MSF <foster...@protonmail.com> wrote: > >> More polarized fun... >> >> A much more easily viewed demonstration of the effect we are discussing >> here is looking at clear glass table tops outside. If you happen to have >> some lawn furniture that includes a clear tempered glass table top, all you >> have to do is stand to the east or west of of the glass and look down at it >> at an angle of approximately 56 degrees and you will see beautiful pools of >> color. The colors outline the birefringence caused by the strains in the >> tempered glass. >> >> Once in a while a random observation at my back yard of the phenomenon by >> a friend or family member will be alarmed at "something wrong with the >> glass". And of course, their eyes glaze over when I try to explain it. >> >> You might wonder why I immediately recognized Harry's noticing of >> mysterious color effects during his walk. It's simple. When I was very >> young, I used to see these colors in the pavement all the time, directly >> on, not peripherily. The reason is my brother and I were blessed, or >> cursed, with vision that was so sharp and light sensitive that we were >> accused all the time of "seeing things". We tested out at 20-05 on the eye >> charts. Our retinas must have been so stuffed withe rods and cones, I'm >> surprised they didn't explode. I could see close to 7th magnitude stars. >> That's all gone now that I'm old. Down to 20-20 with lens implants. >> >> Please pardon my self-indulgent nostalgia. >> >> MSF >> >> >> >> >> >>> >>> >>
