Answer:
In coketown, all the houses are built with red and black bricks. The red color has become dull and black due to the smoke coming out from the factories. These red and black buildings look like the painted face of savage. The buildings are all alike, expect the new Church.
This description of the buildings suggest that coketown is a town which is full of dullness, pollution, lack of variety and lack of interest in the people. All the streets look alike, all the buildings look alike, all of the people do the same work, and all the days are similar. People have lost their identitites, feelings and creativity, which have made turned them into aliens.