There are a few logical reasons why someone would systematically flip over all of the floorboards in a Venetian boat.
The person who maintains her may have done so to allow the bilge to dry.
Simply tipping them up in place, with a slight turn will often achieve the same goal.
But then everyone's got their preferences.
Perhaps the floorboards were getting some algae or moss growing underneath, so they got a good scrubbing and were flipped
to allow them to dry.
They are upside down; a close look at the inside ends of the rib notches will attest to it.
Maybe they got flipped over by a drunk boat owner?
Or maybe some kids were looking to play a joke on the owner of the boat.
I suppose the boat was just sold and the new owner hadn't yet figured out how the floor pieced together.
Anybody else got a good explanation?