Yes, I think that the third level was a medium of escape for Charley. The third level is an escape for Charley from the modern setting of worry and insecurity. It is an escape from the unhappy contemporary world that is full of insecurity, fear, war, and worry. He had always desired to live his life peacefully as he did in Galesburg. Charlie was so upset and frustrated with modern life and the way of living that he wanted to move back into the past. Thus, in his mind, he has forever wanted to go back in time, so he found the third level as a realization of his dream.