I can't find anything for Purkinje at the beach, do you know where you heard it?
A web article with an illustration. I can't find it. But from "Purkinje's Vision: Dawn of Neuroscience"
"The first phenomenon described by Purkinje was novel: He produced flicker, while looking at the bright sky, by waving his fingers in front of one eye and reported seeing checkerboards, zigzags, spirals, and ray patterns (see Fig. 3.2, Figs. 1–4). They were called shadow figures by Helmholtz (1867, 2000b) and are now referred to as stroboscopic patterns (Smythies, 1957), although they were described before the stroboscope was invented."
Re:God Helmet
by toomanybeersies on Tuesday March 24, 2020 @05:48AM
(#22673341)
Got any links to resources around making one of these things? Sounds like an interesting project.
Re:God Helmet
by tecleandor on Tuesday March 24, 2020 @06:25AM
(#22673538)
Adafruit used to sell the kit (not anymore), but you have the instructions, parts list, pcb files and firmware (on the download section) and everything here:
Interestingly, the effect was discovered by the neuroscientist purkinje while at the beach as a boy. He noticed that waving his open fingers over his eyes produced geometric hallucinations and later published his drawings -- back in the mid 1800s.