The geometric pattern is typically set within a rectangular frame and is often repeated. With careful mathematical calculations, a skilled craftsperson is able to construct the regimented balustrade, which is often found on porches, decks, widow walks and staircases.
The next time you find yourself in a historic neighborhood with well-preserved homes, take a look-see at the balustrades. You're guaranteed to stumble upon a Chippendale or two. Heck, even Thomas Jefferson used them at Monticello.