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Originally Posted by yvanleterrible
If my memory serves me right gray levels are achieved by partly rotating bi colored particles.
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If you can partly rotate the particle, you can rotate it so any side is up. If the particle is a cube, say, you can show red, green, yellow, blue, black, white. Each side pure, each side showing only that side, no partial sides exposed. (Not that cubes would be best, since if you pack them close, you can't rotate them. A three-sided prism could have a flat side always up, and the other two sides not showing. Even better are more complex shapes, like three circles intersecting at right angles. Except hexagons work better for packing purposes, with them rotating along point-to-point diameters, always showing a single color plane face on, with intersecting planes edge-on [and you could color the edges to match the planes]). You never show mixed colors within a single cell, never half-black half-white to make grey. Each cell is pure, with mixing only intercell, although if the particles have enough colors, sides can come premixed.