 Instead, our world moves along in a stream of time, and to move to a different place in time is to move to another world altogether.Thus in "City" our Earth is overrun by ants, but the intelligent dogs and the remaining humans escape to other worlds in the time stream.In "Ring Around the Sun" the persecuted paranormals escape to other Earths which, if they could all be seen at once, would be at different stages of their orbit around the sun, hence the title.