Answer:
Keeping up appearances in society.
Explanation:
One of the themes that is highlighted in this excerpt is that of keeping up appearances in society. In this excerpt, we learn that Ilyich's house was like any other house of his social class. He had strived to make it so, in order to fit in with his class. However, we also learn that the style these people chose was meant to appear rich, even when in reality they were families of modest means. This shows that the decoration of the house served the purpose of keeping up appearances in society.