Portrait of fra Luca Pacioli, by an unidentified Venetian painter known by the pseudonym of Jaco Bar. The painting is in the National Gallery (Museo di Capodimonte) of Naples. The religious, dressed in a gray habit, is shown at the center of the picture on the other side of a table covered by a green cloth on which are a goniometer, a compass, a book, an inkpot, a wooden polyhedron and other objects. The mathematician has his left hand on an open book, and is drawing a geometric figure on a small blackboard with his right. A large faceted crystal polyhedron hangs from above by a red thread. On the friar's left is a young man in sumptuous Renaissance attire