This is just using a "multi-band" colormap, no? I thought it would do something clever with shading or something but this is just a scale that instead of going

This is just using a "multi-band" colormap, no? I thought it would do something clever with shading or something but this is just a scale that instead of going 0-1 goes 0-1-0-1-0-1... while rotating hue. It seems to have a lot of perceptual artifacts/nonuniformities, like you would get a totally different feel from some areas if the scale was shifted 500m. It does nicely highlight mountain ranges/areas of rough terrain.