Markov partitions reflecting the geometry of x2,x3
  We give an explicit geometric description of the $\times2,\times3$ system, and use his to study a uniform family of Markov partitions related to those of Wilson and Abramov. The behaviour of these partitions is stable across expansive cones and transitions in this behaviour detects the non-expansive lines. 
Thomas Ward and Yuki Yayama