In what way does Matteo's home reflect his grief and sorrow in the novel, Olga Dies Dreaming?

After his mother dies, Matteo begins hoarding. His house is filled with everything he has collected over the years, particularly furniture. When Olga first sees the space, she realizes that Matteo has used hoarding as a way to quell his grief. The house therefore reflects Matteo's attempts to overcome his sorrow.