Neville found he could put his imagination anywhere in space. He put it into his own nephew, and when his sister looked at her son Billie - who was about to make his exit - she saw not her son's face but her brother's. That night she wrote to tell him she had seen his face and not Billie's. He describes the act in the language of the lecture: I laid down Esau and became Jacob, and became Billie, and determined to be seen by my sister. It is his standing proof that a man is always where he is in his imagination, and that the separation of Jacob from Esau can be used deliberately.