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. Author manuscript; available in PMC: 2012 Dec 4.
Published in final edited form as: Nat Comput. 2012 Jun 1;11(2):323–338. doi: 10.1007/s11047-011-9268-7

Figure 9.

Figure 9

Level 3 misassembly. During asynchronous assembly, there could be level 1 squares still present during level 3 assembly. If one binds in place of a level 2 square, it is not possible for the Highway Tiles to bind and reach the center of the growing square, thus the Decision Tile cannot bind and assembly is halted.