The whole idea of colour and light frequency is fascinating.

These are just frequencies of light, but the subjective experience of them is so much more.

And the whole thing of my perception of "red" or what I call "red" could be very different to someone else's subjective perception. But we would both call it red and associate it with the same thing, fire, love, heat, danger etc.

I worked with a brown laser when I was in grad school. It made a couple of brown spots on the wall by accident.

FYI if you get ocular/retinal migraines like me then the exercise in this article might be a bad idea.

For those not seeing it or only seeing a little, stare at it for a while then shake your head (or your phone) just a bit.