This regular hypercompact hyperbolic tesselation uses the heat in the sense of an infinite bollohedron as one of its cells.

Incidence matrix according to Dynkin symbol

o3o3o7x   (N,M → ∞)

. . . . | 7NM ♦    4 |   6 |  4
--------+-----+------+-----+---
. . . x |   2 | 14NM |   3 |  3
--------+-----+------+-----+---
. . o7x |   7 |    7 | 6NM |  2
--------+-----+------+-----+---
. o3o7x ♦ 14M |  21M |  6M | 2N