The school of thought beyond that of post-modernism. Followed by post-post-post-modernism, which can either repeat back to modernism in a more "on-purpose"ful manner, or just make absolutely no sense at all. Ever.
Modernism: Writing something clever and witty on a billboard.
Post-Modernism: Writing the words "something clever and witty" on a billboard.
Post-Post-Modernism: Writing a billboard on some words.
Post-Post-Post-Modernism: Nailing a herring to a wall and punching it with a racquetball from 4-5 feet away while reciting Dostoyevsky quotes.