Circle
shows hues and saturation (mixing to white or black) but not =value.
Need
three parameters to fully describe a color. Can use RGB (like the eye…) or
translate these into HSB (alvy) which can be much more intuitive to choose
from. Also Alvy’s HWB (hue-white-black) space.
Can
envision such spaces as cubes with axes of RGB (here) : show real cube and
relate to upper right.
