"Will" (Matt Damon) is a rudderless character who works as a caretaker. He's an attitudinal pain in the neck whom, aside from his best friend "Chuckie" (Ben Affleck), is pretty much shunned by everyone. "Professor Lambeau" (Stellan Skarsgård) spots some potential in this wayward lad, especially when he realises that he has an amazing ability to solve mathematical problems. To that end he sends him to see the eccentric psychologist "Sean" (Robin Williams) who proves remarkably adept at cutting down the young man's defences and at beginning to rebuild the character of the man in a more positive and life-affirming fashion. The film combines some excellent performances from all four men, but especially a bang on-form Williams as the penetrative, but flawed, route to salvation for an equally flawed and angry almost younger version of himself in the genius "Will". Damon is entirely convincing as his temper and his prodigious nature are juggled adeptly and aided by a powerful script that allows the actors to take and keep centre stage as the potency of the plot becomes more and more focussed, we are presented here with a ground-breaking and thought-provoking look at what makes a great teacher as well as what makes a human being tick, what makes one happy and fulfilled - and what makes one the opposite! For my money, Gus Van Sant's finest interpretative work and well worth watching a few times, for more detail emerges to appreciate each time you see it.