How does chapter 5 book 1 explore the theme of resourcefulness?

Basically they are being systematically hunted by the Nazis. Vladek must be resourceful if he is to feed and protect his family. In Srodula, the Germans begin to round up Jews at random. To protect himself and his family, Vladek builds a shelter under a coal bin, in which they hide during Nazi searches. Soon, though, they are moved to a different house. Again, Vladek builds a shelter, this time in the attic and accessible only through a chandelier in the ceiling.