Like the comics art it dissects, Mort Walker’s legendary Lexicon of Comicana is unseriously serious. It is a lighthearted, profusely illustrated breakdown of the visual language of comics, the tropes, conventions, conceits, cliches that artists use to communicate a range of emotions and personalities at a glance. NYRB Comics has reissued this hard-to-find 1980 classic with a ton of supporting material from Chris Ware and Brian Walker. It is a must-have for anyone interested in the medium.