Tipping Point's Producing Artistic Director James R. Kuhl sums up the theater's latest play brilliantly."It's brilliant," he says. "Everything about it is brilliant.""Every Brilliant Thing," which opens Jan. 20 at the downtown Northville theater, begins with a 7-year-old who, while dealing with his mother's depression, makes a list of everything in life worth living for: ice cream, Kung Fu movies, burning things, laughing so hard you shoot milk out your nose, construction cranes and "me.