It has been proposed in two recent articles by this author (Tully 1986, 1987) that rich clusters of galaxies tend to congregate in complexes involving of order 50 clusters over regions roughly 300 h75−1 Mpc across. The particular complex that we reside in has the additional remarkable property that the clusters are concentrated in a plane that is coincident with the plane described by the distribution of nearby galaxies. The extraordinary coincidence between the plane defined by rich clusters at a characteristic velocity of 15,000 km s−1 and the plane defined by galaxies at a characteristic velocity of 1500 km s−1 suggests a causal connection.