(43) Murner's memory system

More than anything else, some of the bizarre images in the hell scene resemble illustrations in textbooks. The Logica Memorativa contained instructions on how to cut out the illustrations and use them as flash cards for remembering the text. The half dog has to do with disjunct definitions of four types (a, b, c, and d).
In El Jardín de las Delicias/The Garden of Delights and probably also in the Logica Memorativa, it is also a joke about Plato’s definition of man as a featherless biped. Murner was a Franciscan, and it seems reasonably likely the dogs were also a joke about the Dominicans (domini canes).