  The infinite tumbling block graph is a bipartite graph, where each vertex in
one partite set is of degree 3 and each vertex in the other partite set is of
degree 6. It is a 2-dimensional array of blocks of seven vertices and nine
edges, a planar graph that has 3-D looks. This paper introduces tumbling block
graphs and considers various graphical parameters for different classes of
infinite and finite tumbling blocks.
