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"Wit is the diagram of innovative action. Along with Peirce and mathematicians, I intend diagram to be the sign that reproduces a miniature version of the structure and internal proportions of a given phenomenon (like an equation or a geographical map). Wit is the logical and linguistic diagram of enterprises that interrupt the circular flow of experience in situations of historical or biographical crisis. It is the microcosm inside which we can neatly discern changes in the direction of arguments and shifts in meaning, that in the macrocosm of human praxis cause a variation in a form of life. In short: wit is a circumscribed linguistic game with its peculiar techniques and its eminent function is to exhibit the transformability of all linguistic games."
Paolo Virno "Wit and Innovation"
http://transform.eipcp.net/transversal/0207/virno/en