Thoreau’s koan

“I long ago lost a hound, a bay horse and a turtle dove, and am still on their trail. Many are the travelers I have spoken to concerning them, describing their tracks and what calls they answered to. I have met one or two who have heard the hound and the tramp of the horse and even seen the dove disappear behind a cloud, and they seemed as anxious to recover them as if they had lost them themselves.”