And in the morning, diamonds of frost
Express amazement: Whose spurred feet have crossed
From left to right the blank page of the road?
Reading from left to right in winter's code:
A dot, an arrow pointing back; repeat:
Dot, arrow pointing back... A pheasant's feet!
Torquated beauty, sublimated grouse,
Finding your China right behind my house.
Was he in Sherlock Holmes, the fellow whose
Tracks pointed back when he reversed his shoes?

from Pale Fire, Canto 1