Octagonal duoprism

The 8-8 duoprism or odip is a noble uniform duoprism that consists of 16 octagonal prisms and 64 vertices. It is also the 16-7 gyrochoron.

The 8-8 duoprism can be vertex-inscribed into a small rhombated tesseract or small prismatotetracontoctachoron.

This polychoron can be alternated into a 4-4 duoantiprism, although it cannot be made uniform. Eight of the octagons can also be alternated into long rectangles to create a bialternatosnub 4-4 duoprism, which is also nonuniform.

Vertex coordinates
The vertices of an 8-8 duoprism of edge length 1, centered at the origin, are given by:
 * (±1/2, ±(1+$\sqrt{2}$)/2, ±1/2, ±(1+$\sqrt{2}$)/2)
 * (±1/2, ±(1+$\sqrt{2}$)/2, ±(1+$\sqrt{2}$)/2, ±1/2)
 * (±(1+$\sqrt{2}$)/2, ±1/2, ±1/2, ±(1+$\sqrt{2}$)/2)
 * (±1/2, ±(1+$\sqrt{2}$)/2), ±1/2, ±(1+$\sqrt{2}$)/2))