The diptych of Probianus. In the left upper image we see Probianus writing on a scroll, with his secretaries writing on wax tablets. In the write upper image we see Probianus with his right hand raised in an oratorical position. In the left lower image we see orators with their right hands raised while they hold papyrus rolls in their left hands, with their fingers used as place holders. This detail is even clearer in the depiction of the right figure in the lower right image.