From: The World In Your Head by Steven Lehar

Fig. 7.2 (A) If the architect’s model used a smaller scale in one dimension than in the other two, the model would appear flattened in that dimension, while remaining isomorphic with the world that it models. (B) The unequal scaling would not be apparent to the little man living in the model world, because his measure of distance would be compressed along with the compression of his space. If, however, the man could see out to the greater external world, he would observe an inverse scaling, or expansion in that same dimension relative to his internal model world.