Famous painting

Famous painting
He handed me the very paper which I have here, Watson, and this is the strange catechism to which each Musgrave had to submit when he came to man's estate. I will read you the questions and answers as they stand.
""Whose was it?"
" `His who is gone."
""Who shall have it?"
" `He who will come."
""Where was the sun?"
" "Over the oak."
""Where was the shadow?"
" "Under the elm."
""How was it stepped?"
" "North by ten and by ten, east by five
-485-and by five, south by two and by two, west by one and by one, and so under."
""What shall we give for it?"
" "All that is ours."
""Why should we give it?"