Charlie explained that the dentil is one of several classical ornaments that the Greeks derived from the timber framing on which they modeled their architecture; dentils were inspired by the exposed tips of the lath used to support the roofing material — which was precisely what the ones on my building were going to do.
From A Place of My Own, Michael Pollan’s lighthearted account of building a small writing “shack” with the help of his architect, Charlie, and “master of the material world” helper, Joe.