what kinds of details does Kafka use to establish Gregor's life his metamorphosis into an insect. how do these familiar deta objects define Gregor's character and life

Kafka uses words to describe Gregor as a monster: gregor has many little legs, has a sort of shell that covers his body and so on.

Besides, the reactions of his family when they see him as the insect are of pure horror and disgust. This is why even one family member says that in that form, Gregor should simply be put down.