As an ex-schoolteacher of 'sums and drums', headmaster O'Connor dons his tattered mortar-board and takes a backwards glance at learning. Aided by his erudite pupils, CHRIS EMMETT and CAROLINE GRUBER , as well as story-tellers JEFF STEVENSON and MICK WALKER (still in their short trousers), Tom tries to find the roots of Pythagoras' theorem of laughter. Guest, Paul Shane , appears from behind the bicycle sheds to visit, and the 'public at large' gives its version of the verb 'to learn'. Script associate BARRY FAULKNER Sound supervisor DAVID THOMPSON Lighting director ANAN HORNE Set designer MARTIN METHVEN Production RICK GARDNER