Architectonic and catoptric tessellation explained

In geometry, John Horton Conway defines architectonic and catoptric tessellations as the uniform tessellations (or honeycombs) of Euclidean 3-space with prime space groups and their duals, as three-dimensional analogue of the Platonic, Archimedean, and Catalan tiling of the plane. The singular vertex figure of an architectonic tessellation is the dual of the cell of the corresponding catoptric tessellation, and vice versa. The cubille is the only Platonic (regular) tessellation of 3-space, and is self-dual. There are other uniform honeycombs constructed as gyrations or prismatic stacks (and their duals) which are excluded from these categories.

Enumeration

The pairs of architectonic and catoptric tessellations are listed below with their symmetry group. These tessellations only represent four symmetry space groups, and also all within the cubic crystal system. Many of these tessellations can be defined in multiple symmetry groups, so in each case the highest symmetry is expressed.

Vertex Figures

The vertex figures of all architectonic honeycombs, and the dual cells of all catoptric honeycombs are shown below, at the same scale and the same orientation:

Symmetry

These four symmetry groups are labeled as:

LabelDescriptionspace group
Intl symbol
Geometric
notation[2]
Coxeter
notation
Fibrifold
notation
bcbicubic symmetry
or extended cubic symmetry
(221) ImmI43
8°:2
ncnormal cubic symmetry(229) PmmP43[4,3,4]
4:2
fchalf-cubic symmetry(225) FmmF43[4,3<sup>1,1</sup>] = [4,3,4,1<sup>+</sup>]
2:2
ddiamond symmetry
or extended quarter-cubic symmetry
(227) FdmFd4n33[4] = 1+,4,3,4,1+
2+:2

References

Further reading

Notes and References

  1. For cross-referencing of Architectonic solids, they are given with list indices from Andreini (1-22), Williams(1-2,9-19), Johnson (11-19, 21-25, 31-34, 41-49, 51-52, 61-65), and Grünbaum(1-28). Coxeters names are based on δ4 as a cubic honeycomb, hδ4 as an alternated cubic honeycomb, and qδ4 as a quarter cubic honeycomb.
  2. Hestenes . David . Holt . Jeremy . 2007-02-27 . Crystallographic space groups in geometric algebra . Journal of Mathematical Physics . 48 . 2 . 023514 . AIP Publishing LLC . 1089-7658 . 10.1063/1.2426416 .