 This was the method of choice for building protein crystallographic models into electron density until the late 1970s, when it was superseded by molecular computer graphics programs such as Grip-75 and then Frodo.Richards showed his sense of humor in a later review of developments in the use and construction of Richards boxes.He provided a "correction to the Original Bibliographic Citations," complete with diagrams, for a theatrical stage technique that used selective illumination and a sheet of plate glass inclined at 45° to give an illusion of the nymph Amphitrite rising from the sea and floating in air, or of an audience volunteer dissolving to a skeleton and back again.