The obvious question to ask is could you take it to the third dimension and make a cube out of double-doubles? What about other shapes, perhaps a pyramid or a t

The obvious question to ask is could you take it to the third dimension and make a cube out of double-doubles? What about other shapes, perhaps a pyramid or a tetrahedron? Squares are simple enough that it's still easy to come up with examples, but I think a graph with higher edges-to-vertices ratio would be even more satisfying.