[astrange]

> If we pick on the common example of red-green colorblindness (of which there are many types; to have something concrete to work with, let's say all cones function at "normal" intensity, but the spectrum for the red cone has been shifted near to what the green cone picks up), what kinds of mappings are you able to do?

You could animate it by changing the mapping over time; then colorblind people would see that two identical colors are changing differently.

You could also try replacing colors with a pattern but it wouldn't work that well.