Christmas in Narnia

In the last of his Chronicles of Narnia books, C.S. Lewis includes a short dialogue that links his fantasy world with his belief in the mystery of Jesus' incarnation.
"It seems, then," said Tirian, "that the Stable seen from within and the Stable seen from without are two different places."
"Yes," said Lord Digory. "Its inside is bigger than its outside."
"Yes," said Queen Lucy. "In our world too, a Stable once had something inside it that was bigger than our whole world."

Source: The Last Battle