 We might note the it is common to find, in authoritative texts, definitions like “Color attributes are attributes of visual sensations, e.g., hue, saturation and brightness”; “hue: attribute of color perception denoted by the terms yellow, red, blue, green and so forth”; “Brightness is the attribute of a visual sensation according to which a given visual stimulus appears to be more or less intense”. There is a range of ways we might interpret these definitions: