  When a voltage is applied across a thin layer of cholesteric liquid crystal,
fingers of cholesteric alignment can form and propagate in the layer. In
computer simulation, based on experimental laboratory results, we demonstrate
that these cholesteric fingers can solve selected problems of computational
geometry, logic and arithmetics. We show that branching fingers approximate a
planar Voronoi diagram, and non-branching fingers produce a convex subdivision
of concave polygons. We also provide a detailed blue-print and simulation of a
one-bit half-adder functioning on the principles of collision-based computing,
where the implementation is via collision of liquid crystal fingers with
obstacles and other fingers.
