Quintilian Institutio Oratoria 6.3.61

[61] Still more ingenious is the application of one thing to another on the ground of some resemblance, that is to say the adaptation to one thing of a circumstance which usually applies to something else, a type of jest which we may regard as being an ingenious form of fiction. For example, when ivory models of captured towns were carried in Caesar's triumphal procession, and a few days later wooden models of the same kind were carried at the triumph of Fabius Maximus, ¹ Chrysippus ² remarked that the latter were the cases for Caesar's ivory towns. And Pedo ³ said of a heavy-armed gladiator who was pursuing another armed with a net and failed to strike him,