Last week, Daedalus planned to grow carbon nanotubes on a catalytic anode with circular reaction sites. Now, he wants to generalize the idea by making the reaction template more complicated. A hexagonal lattice of reaction sites, for example, would grow carbon honeycomb. Strong and light for structural purposes, carbon honeycomb could also be used as an insulator, a one-dimensional conductor, a molecular sieve or an absorbent.