The massive walls of the canyon rose sheer above the water, almost four thousand feet. Presently, the boats became separated. In one of them, a single companion--the boatman--and I floated on alone. I have never known such beauty, for the moon was full, and by some witchery or enchantment, its mellow light turned all the river into a street of burnished gold and transformed the massive headlands and giant pinnacles into such shining walls and battlements and towers, as John the Beloved beheld in his vision on Patmos, of the glory and wonder of the city of God.