The Apadana at Persepolis
Darius’s audience hall: a square forest of slender columns about 12 diameters high, their double-bull capitals carrying cedar beams.
The rules it illustrates
Slender columns under a timber roof. Where the roof is of timber, make the columns tall, slender (about twelve diameters) and widely spaced, and fill the hall with them on a square grid.
Beams in the saddle of the double bull. Crown the Persian column with two kneeling bulls (or lions, or griffins) set back to back; lay the main beam in the saddle between their necks, and the cross-beams on their heads.
Raise the palace on a terrace, reached by gentle stairs. Set the royal buildings on a raised terrace; climb it by broad double stairs with very low, deep steps, and line their parapets with reliefs of the procession that climbs them.
Where it appears in the book
In the styles Achaemenid Persian.
In the chapters Post and Lintel, The Ancient World.