Looking across Prinsengracht © 1997 the archive of light <    >

The pilot slows down his barge, the DeMeeuw, as the bow approaches a bridge abutment. You can imagine that it's reckless, dangerous, and very bad form to bump a boat up against the largely unprotected piers of the bridges that span the canals. So two members of the crew keep an eye on the gap between the boat and the bridge.