Growth Inside a Corner: The Limiting Interface Shape
  We investigate the growth of a crystal that is built by depositing cubes onto the inside of a corner. The interface of this crystal evolves into a limiting shape in the long-time limit. Building on known results for the corresponding two-dimensional system and accounting for the symmetries of the three-dimensional problem, we conjecture a governing equation for the evolution of the interface profile. We solve this equation analytically and find excellent agreement with simulations of the growth process. We also present a generalization to arbitrary spatial dimension. 
Jason Olejarz, P. L. Krapivsky, S. Redner, K. Mallick
cond-mat.stat-mech