Stereotomy, which means the cutting of solids, was a seventeenth-century French rubric under which were gathered several existing techniques including stonecutting, which remained the principal concern. The basis of stonecutting was the trait. Traits were layout drawings used to enable the precise cutting of component masonry blocks for complex architectural forms, especially vaults. Thereby accurate fabrication of parts could be achieved prior to construction. Traits are not illustrations and yield little to the casual observer.
the trompe built on the garden side of the chateau at Anet by Philibert Delorme between 1549 and 1551.