Fanned by a constant updraught of ventilation between the kitchen and the chimneyflue, ignition was communicated from the faggots of precombustible fuel to polyhedral masses of bituminous coal, containing in compressed mineral form the foliated fossilised decidua of primeval forests which had in turn derived their vegetative existence from the sun, primal source of heat (radiant), transmitted through omnipresent luminiferous diathermanous ether.
There are no more uses of "polyhedron" in the book.
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There are only five "regular" polyhedra.
Modern architecture has moved beyond simple polyhedrons like pyramids and rectangular skyscrapers.