Can someone please explain this quote from "The Metamorphosis" and what it has to do with alienation?"Likewise the ash can and the garbage can from...

There is tremendous importance in this quote and the way
that it describes how the room where Gregor dwelled became used by the family as time
passed and as they took in lodgers. Note the full quote that is given in my translation
of this classic work:

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For this reason, many of the family's belongings
had become superfluous; but while they had not prospects of selling them, they did not
want to throw them out either. All these items wound up in Gregor's room--as did the ash
bucket and the garbage can from the kitchen. If anything was unusable at the moment, the
charwoman, who was always in a mad rush, would simpley toss it into Gregor's
room...

Clearly, Gregor's
room, and therefore Gregor, is associated with objects that the family now no longer
need and are "superfluous." As time goes by, Gregor is more and more alienated by the
attitude of his family as he becomes unnecessary to their lives and forgotten by them.
That these forgotten, unnecessary items are thrust into Gregor's room along with the
garbage is a strong indication of how Gregor is being treated. He is now nothing more
than a piece of detritus to the family, like an extra bit of furniture that has no
purpose or function and is thrust into a room and forgotten
about.