The synthesis and structural analysis of supramolecular dendrimers self-assembled from 3 libraries containing 20 first-generation hybrid dendrons are reported. Combinations of benzyl ether, naphthyl methyl ether, and biphenyl methyl ether repeat units with different alkyl cartxmlates at the apex of the dendron decreased its molecular solid angle to values that led to the discovery of a new mechanism of self-assembly. This new self-assembly mechanism generated a diversity of unprecedented supramolecular assemblies, including hollow and nonhollow singly or doubly segregated supramolecular columns and vesicles exhibiting polyhedral shapes. The polyhedral shape of the self-organized supramolecular dendrimers was demonstrated to be an intrinsic characteristic of all the doubly segregated structures. The self-assembly mechanism elucidated here provides access to new strategies that will be used to fabricate complex supramolecular organizations.