Robert Sparks Walker, « Nature the originator » The Homiletic Review, New York, Funk and Wagnalls Company, 1922.

The harmony of the universe is poetry, and man becomes a poet when he can translate this into language. Throught the little potter-wasps that build out of sand and clay wonderful designs of pottery nature has taught mankind the art of making pottery. The little caddis-worm that lives in cool springs and constructs its cocoons of stone and cements them together taught humanity the art of building houses out of stone.The mud-dauber was the first builder of the apartment house.