COLORS = {
    TRANSPARENT = vec4(0.4),

    -- tones
    WHITE = vec4(0.8, 0.8, 0.7, 1),
    BLACK = vec4(0, 0, 0, 1),
    TRUEBLACK = vec4(0, 0, 0, 1),

    -- hues
    BLUE_STONE = vec4(0.12, 0.3, 0.3, 1),
    MYRTLE = vec4(0.10, 0.25, 0.10, 1),
    BROWN_POD = vec4(0.25, 0.20, 0.10, 1),
    BOTTLE_GREEN = vec4(0.15, 0.30, 0.20, 1),
    MAGENTA = vec4(1, 0, 1, 1)
}