What metaphors are used in The Street by Ann Petry?

In Chapter Eight, Petry uses metaphors in Lutie's nightmare, when Jones' mouth becomes that of the dog, and all of the residents become rats. Metaphors reappear, when everyone in the nightmare has a building chained to their back. The chained buildings represent the fact that they are chained to their current circumstances with little chance of being "unloosed." The fact they all become part or all animal represents the way the black race is treated as animals.