If you are interested in "imaginary" colors, the gamut is actually well-specified, and (I hope it is appropriate to comment) that I made a visualization where you can drag a selection thumb over the gamut to see the "simulated" version of that color. Also include it is a 12-step contrast-sensitive color palette generator for said imaginary colors, which would allow you to make websites and (say) vscode themes using entirely imaginary colors! https://docs.moment.dev/d/hausdorff/2zmqjlmldchela29xvbzlbki...