抄録
The Hasse diagram depicting boolean lattice composed of eight elements has a great similarity to the wire-frame drawings of the RGB color cube. According to the law of reciprocity, 180-degree rotation of the Hasse diagram are caused by replacing all eight elements {(0,0,0), (1,0,0), .., (1,1,1)} with their complements and swapping ∪ and ∩ . Since the elements are used as 3D coordinates, the color cube turns to be seen as CMY cube assigning zero element to vertex W. If the replacement is accompanied with replacement of colors with their complement keeping color names of vertices(K, R, ..., W) unchanged, the reciprocity comes an interesting example of the problem of spectrum inversion.
