You know man, now that I come to think of it, this piece represents what is imprisoning the dudes. The Marmot represents the dudes imprisonment by the Nihilists (you know, because they threatened castration). Walter is imprisoned by his wife's demands (hence the dog house), and Donny...(was a good bowler), he's kind of the opposite. The coffee can represents his freedom and his entrapment. I believe Donny's life began to slow down, to the point where it was purely uneventful and mundane. I like to think he was the best bowler on the team, but was completely unappreciated by Walter and pretty much was unnoticed by the Dude. It was only when under fire in combat that Walter truly felt respect for him, and thus set him free. The coffee can symbolizes his imprisonment and his freedom by his untimely demise. The rug is what ties them all together, as it brings excitement and adventure into each of their lives, the dudes search for the rug prompts all of this to happen, so he to becomes the catalyst in the story. Eventually he finds out that he wasn't searching for the rug, but his own soul and the souls of his friends. Most of all, the soul of Donny and casting that soul into the wind.