Great transitional 15-4 bigyrochoron

The great transitional 15-4 bigyrochoron is a convex isochoric polychoron with 30 identical cells.

Each cell of this polychoron has bilateral symmetry, with 2 mirror-symmetric tetradecagons, 1 rhombus, 6 kites, 4 irregular tetragons, and 4 scalene triangles for faces.