Interesting article!

As an aside I just had a realization: how can this typical representations of color spaces (larger blob of perceptible color and the smaller polygon of the color space) work?

Isn't the image encoded in one of those color spaces? That should make the perceptible-but-not-in-space colors impossible to represent, shouldn't it?

The gradient in blob is the same as the one in the polygon, it’s just there as art to hint at what’s missing