How was Villa Adriana drawn? With which design technology and conceptual instruments was the highly articulated and original architectural composition conceived? This article tries to reconstruct that particular phase of the architectural design in which are unfolded on the architect’s drafting machine the logical-syntactic rules that govern the ideational process in its formalization during an internal time, that delta T suspended between ideation and drawing. Formalization that defines and perfects an ordering principle, which exists and is unitary in Villa Adriana.