The Gondola is symbol of master Venetian craftsmanship. They are built to list to one side so when the gondolier stands to the other side the craft sits straight in the water. Aside from gondolas the city conducted most of it business through these waterways.
One interesting thing I saw was a "mason boat" (my own terminology.) It was a long boat with a cement mixer mounted in the middle. There was cement, sand and gravel on one side with a tender, and the masons worked on the other side. If work needed to be done on the front of a building they pulled up to it and went to work.