Yep, getting all that, Hedd. Where problems appear to occur is like with my environment - in all those flash videos, I see them scanning all over their HDRs and I set up nodes the same way, but all i see is a coloured blur. Clearly, I'm doing something drastically wrong. But what.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks