Leonardo da Vinci and the Pacioli Code by Jerzy K. Kulski. An analysis of Leonardo’s mysterious portrait of Fra Luca Pacioli with patron, polyhedrons, drawing instruments and an encrypted cartouche accompanied by a sinister black fly. The science, mathematics, geometry, symbols, history and pictorial codes of the portraiture of the Franciscan friar and mathematician Luca Pacioli, the condottiero and jouster Galeazzo Sanseverino, and an enigmatic black fly, together with an encoded, mysterious anagram (IACO. B AR. VIGEN NIS. P. 1495) describing the political intrigues in the Duchy of Milan during the time of Leonardo da Vinci.