A pair of tourists in an art gallery are puzzled by a strange tablet depicting men ascending and descending through several concentric enclosures accompanied, accosted, or exhorted by various odd figures. An old man there, having been taught the meaning by the painter of the tablet, offers to explain the allegory of proceeding from base misguided sensuality to the examined life of the stoic philosopher.
I think I got more out of the Enchiridion of Epictetus.
Read in Greek with my study group. It is a bit above our level but we made it through with the help of Prof. Steadman's excellent notes (and running vocabulary) and Sir Francis Poyntz' delightful translation into Middle/Early Modern English (reading the blackletter typeface was even more challenging than reading the Greek alphabet was when we were starting out...)