Lee Ka-sing says he wrote a Zig-Zag poem and I, for one, believe him.  Everybody needs to inhabit morphological eccentricity from time to time, to take temporary residence there.  I once made a poem shaped like a silo.  And there was another that looked like the nacelle of a jet aircraft engine.  I've heard about someone who constructed a poem that called for a thousand raindrops forever suspended in the air, halted on the way to earth by the force of the poet's Ringmaster will (see Celine's "New York as a suspended deluge" in his Voyage au bout de la nuit ).  My latest poem was like sugar in the salt-shaker.