How does Terry Pratchett use imagery in Interesting Times?

Although Pratchett's novel is a fantasy, one crucial technique he uses is that of comedy in an Aristotelian sense. Characters are made farcical, thus rendering them inferior to readers and thereby distancing these readers from the serious undertone of the book. His use of imagery includes deformities that are made ridiculous—such as Cohen's diamond dwarf teeth—and minor faults are magnified—as with Rincewind's practiced art of running away. Distancing the characters in these ways allows the reader to enjoy the tale and the author to discuss serious social concerns such as oppression of the masses.