Small rotational 8-3 bigyrochoron

The small 8-3 bigyrochoron, also known as the broken tesseract, is a convex isochoric polychoron with 16 identical cells.

Each cell of this polychoron is completely asymmetric, with 1 octagon, 2 heptagons, 1 hexagon, 5 tetragons, and 2 triangles for faces.