An event he described as a "concrescence", a "tightening 'gyre'" with everything flowing together. In process philosophy, datum is obtained through the events of concrescence. Radiographs taken at different angles can aid detection of concrescence. "Form, Concrescence, and Concretum" in Explorations in Whitehead's Philosophy (ed. Concrescence teeth could be reshaped and replaced with full crowns.