"Nobody passes the post without a chit, in either direction." – the Keeper, when asked which direction he meant
FIELD REPORT – Ferdinand Lusk REPORT 2 OF 14 SUBJECT: Measurement At the ninth hour of the evening Pell took me out to the post. The flagstones around it are let in with brass marks at every foot and every inch, and he had me stand on the mark at the foot of the post with my back to the lamp and my heels together, and then he walked away from me along my shadow with the chain running out of his hand until he reached the tip of it, and stopped, and read the brass. Eleven feet and four inches. He said that was ordinary for a man of my height at the ninth hour, and that ordinary was a good thing to be. Then he knelt and looked at the shadow sideways, with his cheek nearly on the stone, for some time. Soft-grained, he said. One seam. No lag. I asked what a seam was. He said that a shadow which has lain across another person's shadow for long enough carries a line where they overlapped, and that mine carried one, old, on the left side, and that it was none of his business but it went in ...
From the lore of The Ledger of Shadows.