Communication: WS2 microtubes, ribbons, and ropes are some of the unus
ual forms of inorganic crystals - grown by a chemical transport reacti
on - for which evidence is presented here. The Figure shows a WS2 rope
composed of four nanotubes with one nanotube periodically wound aroun
d the widest tube. A further example, of two nanotubes wound around ea
ch other, can be found on the front cover.