Jan wrote to me - picking up the thread of a discussion we started a couple years ago: Why do some color wheels have red to the right of yellow (assuming yellow is at the top) and blue on the left; while others present in reverse - that is - red on the left and blue on the right? I was curious when she asked about it again, and also quoted painter Stephen Quiller as saying blue goes on the right  and it’s funny (his opinion)  that other people do it “backwards!”

A Google search for “color wheel” indicates that both orientations are common, as is putting yellow lower on the wheel - which looks downright weird to me. Only proving it’s how you learn it for the first time, I suppose, and point made and taken - that basically as long as the complements and tertiaries are in “right relationship” primaries can be oriented any number of ways as the wheel is viewed straight on.

As with all topics, once the research begins, the permutations and variations abound. Wouldn’t it be interesting to know whether orientation is related to northern versus southern hemisphere - or gender origination of the wheel in question?

If anyone gets busy with this, let us know what you discover!

Julie wrote and asked whether different people experience variations - sort of like color blindness - in terms of how we see a color. Not unlike the red/orange issue I noticed in a few early posts, but eventually dismissed as photography/lighting oddities.

I don’t have a scientific report to quote, but there do appear to be vision-related physical differences - most of them very minor - in how each of us perceives a color. That’s why the color constant is such a useful concept and tool.