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Originally Posted by Jadon
If you can partly rotate the particle, you can rotate it so any side is up.
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Not so. If your ability to rotate a particle cannot control which axis it rotates on, but only the degree of rotation (which would be the case with electrical polarization), then your options are much more limited. If you were able to manufacture perfect cubes at that size (and this would be a lot harder than the approximately spherical particles I suspect they are using now), you could possibly get 3 colors: top, bottom, side. A prism shape allowing more colors would also not hide the colors not in use well enough.
I'm sure there are ways to manipulate the particles along more axes, but I don't see a way to do it using the top/bottom electrodes in the current generation of e-ink.