[deckar01]

I’m surprised the section towards them end about alternating high contrast colors producing impossible colors doesn’t link to “fechner colors” [0]. I am red-green colorblind, but when I was young I would stare at my dark ceiling fan spinning over the white ceiling and see very vivid greens and purples swimming across the blades.

[0]: https://en.m.wikipedia.org/wiki/Fechner_color

[King-Aaron]

Anecdotally, in my first year of university a tutor of mine did a demonstration on Fechner Colour. We walked into the lab and he had a spinning disc on a motor, that was apparently pink in colour. He asked the class (*first year students) what colours we thought each half of the disc were to create the pink shade. Most people guessed pink and white, while a couple of people had correct guesses..

When he stopped the motor, the disc spun down and it was yellow on one side, and blue on the other.

[skrebbel]

Seems like you're well positioned to add that to the article‽

[camillomiller]

The interrobang is spreading all over hackernews!

[JetSpiegel]

It was the subject of the latest 99 Percent Invisible podcast.

[superflyguy]

From the people who brought you uptalking? and the Indian Head Wobble, comes another thing which means absolutely nothing.

[gugagore]

Just because you don't, like, literally know what it means, doesn't mean it means nothing! In any case, I could care less.

[superflyguy]

You probably meant "I couldn't care less" - that is, there is nothing I care less about.

[starshadowx2]

My local science centre has had a Benham's top that you spin yourself in one of its permanent exhibits for probably over 15 years now and it's always really cool to see. It fascinates me that you can see yellow, purple, and green on a disk of only black and white.

[nyreed]

Wow, I often as a child (still now) would see vivid purple and greens when I closed my eyes or in a dark room. I never thought about it but I wonder what the cause is.