The image that struck me most was when Andy tossed the glass bowl of pebbles onto his cocktail table. All of the rocks were smooth and oval, with glossy finishes, except: one jagged stone, pale in color, larger than the others. It stood out, just as Andy did, a point brought home forcefully after the backyard confrontation with his father.
Or maybe Andy's problem was NOT standing out, not mattering enough, being enough in the family, in his marriage, at his job, in the world. The large pale pebble clattering onto the table, was an obstructing sore thumb, marring the symetric beauty of the other cascading stones, as they all fell together.