Sentient polyhedron

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"Two of the less irrelevantly moving things - a rather large congeries of iridescent, prolately spheroidal bubbles and a very much smaller polyhedron of unknown colours and rapidly shifting surface angles - seemed to take notice of him and follow him about or float ahead as he changed position among the titan prisms, labyrinths, cube-and-plane clusters and quasi-buildings"

-H.P. Lovecraft, Dreams In the Witch-House