Yes, and the triangular infinihedron forms a dual pair with the hexagonal infinihedron. The quadratic infinihedron is its own dual, as the tetrahedron is. (Pol

Yes, and the triangular infinihedron forms a dual pair with the hexagonal infinihedron. The quadratic infinihedron is its own dual, as the tetrahedron is. (Polyhedronal duality: Surface midpoints are vertices of the dual. Ex: The six surface midpoints of a cube are the six vertices of a regular octahedron; and vice versa.)