Pressing the button in the frame below generates the slice with constant L, then on the right side will appear the slice through the chosen vertices with a perpendicular plane.
This frame presents the top and the chosen side views of the double hexcone HLS colour model.
Legend:
R - red (rdeča)
Y - yellow (rumena)
G - green (zelena)
C - cyan (sv. modra)
B - blue (modra)
M - magenta (škrlatna)