What metaphors are used in The Caretaker by Harold Pinter?

The play is set in a single room. The room is dismal and filled with unwanted junk.... paint buckets, a lawn-mower, suitcases, a rolled-up carpet, a pile of old newspapers, and a statue of the Buddha atop a gas stove that does not work. A bucket, used to catch water from the leaking roof, hangs from the ceiling. The room appears to be a storage space rather than the living space it is. The room stores not only useless junk but, metaphorically, useless people such as Aston, who can no longer have a real life in the outside world, and briefly Davies, who, in a sense, is just another useless thing that Aston has picked up and brought back to the room.