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A fine example from Orvieto, now in the Museum at Florence, consists of a rectangular moulded base topped by a spheroidal black stone

desire lines via reference library (via sweet juniper)

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via uuiuu!

Dome Book 2, ed. Kahn, Lloyd, Pacific Domes, 1971
pdf available from Public Collectors and Let's Remake



Also of interest is the whole whole earth catalog.

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