The tholos tomb
The “Treasury of Atreus” at Mycenae (c. 1250 BC): a dromos, a lintel of some 120 tonnes under a relieving triangle, and a corbelled beehive dome of 33 courses.
The rules it illustrates
The corbelled dome: rings stepping inward. Build a round chamber of horizontal courses, each ring projecting a little beyond the one below, dress the inner face to a smooth curve, close the top with a capstone, and heap earth over the whole.
Where it appears in the book
In the styles Aegean Bronze Age.
In the chapters Post and Lintel, The Ancient World.