If you zoom in far enough, you can also click on the line segments representing year/subgenre combos

That is interesting - I tried the setup you suggested and actually did see something that could be described as yellow++, with maybe a hint of gold/orange

It was also very intense, like staring into the sun. I observed this for both of the two default yellow tints that I could choose via the (Windows?) color picker

I have no idea why this would differ between individuals

Edit: link below with FFFF00 for yellow

https://dynomight.net/img/colors/generate.html?inside=0000ff...

Thank you.

I retried it first thing in the morning, in the dark, with my phone screen at minimum brightness, and no contact lenses in, and I got the expected result - vivid gold for my original setting, vivid yellow for yours.

After putting my contacts in, under medium ambient light, with my phone screen at medium or full brightness, I get the purple ring, but now that I'm looking for it, I can see an outer ring of gold or yellow as well.

The effects is much less pronounced if I put on my reading glasses (while still wearing contacts), so I think it must be an artifact of the contact lenses, probably in combination with the conditions they're supposed to correct (nearsightedness + astigmatism), as well as age-related inability to focus on tiny details with my contacts in.

In Dutch, a porcupine is called a "spike-pig" (stekelvarken)

Edit: and a turtle is also a "shield-toad" (schildpad)

Porcupine is actually the same meaning, porcus (pork) spina (thorn/spike). It's just a bit obfuscated in modern English compared to e.g. Italian (porcospino)