What mood does Dickens create through his description of Mr. Jaggers's office in Great Expectations?

Mr. Jaggers’s London office is small and dark, with only a broken skylight to alleviate the darkness. It is scattered about with papers, broken pistols, and sundry objects which Pip cannot determine the use for. There are marks on the furniture and wall, greasy spots where Jaggers and his clients have rested their heads and shoulders. Most curious of all are two plaster masks. Pip thinks that they must be some of Jaggers’s family, but Wemmick informs him that they are death masks of two “clients” of Jaggers’s who had been executed. Pip realizes much of the relics lying around must be mementos mori (reminders of death) left behind from executed criminals. Overall, Pip is struck by the dismal atmosphere, which he decides is quite in keeping with Mr. Jaggers’s lack of empathy for his clients. He later understands why Wemmick is so businesslike at the office, but so congenial out of it.