Transitional square double tetraswirltegum

The transitional square double tetraswirltegum is a convex isochoric polychoron with 128 identical cells. It is the fourth in an infinite family of isochoric square tegmatic swirlchora, the others being the small square double tetraswirltegum and great square double tetraswirltegum.

Each cell of this polychoron has bilateral symmetry, with 1 rhombus, 2 kites, and 6 isosceles triangles for faces.