Having exhibited the boolean operations, all the necessary material is present to construct a combinatorial circuit; by adding a unit delay, sequential circuits are also possible. Leading the signal along a zigzag is all that would be required, so there is no difficulty. To realize circuitry in a plane, however, crossovers are required.
One technique would be to multiplex a signal along a single wire, then
demultiplex it with the help of a clock. Nevertheless clockless
alternatives are available; one extravagant procedure is to use the
identity 
to release b from an EXCLUSIVE OR
in which a was the left member, and its counterpart to release a on
the right.
