Combinatorics of $A_2$-crystals
  We show that a connected regular $A_2$-crystal (the crystal graph of an irreducible representation of $sl_3$) can be produced from two half-grids by replicating them and glying together in a certain way. Also some extensions and related aspects are discussed. 
V.I. Danilov, A.V. Karzanov, G.A. Koshevoy