As each ship approaches the harbor, it is swarmed with small tugboats that gently pull it to the dock in the correct position. It takes four tugboats to put the larger ships in place. Each ship is different, various colors, lighting, sizes, and cargo arrangements. Each ship takes between two and twelve hours to unload and reload, then it moves on to the next destination. Most of the ships coming to this port are going between various European ports, though of course there are ships coming from Asia and North America.
I found a fascinating web site that makes watching the harbor ten times more fun (http://www.marinetraffic.com/ais/default.aspx?level0=100). It tracks every ship in the harbor and provides information on the name of the ship, where it has come from, and perhaps where it is going. Looking at this web site, it is amazing just how many ships are in the immediate area.
As an example, I selected a ship that would be very visible from my office window called “Pluto”, a cargo ship registered in the Marshall Islands. You can pull up the basics on the vessel as well as a picture gallery uploaded by carge ship enthusiasts (yup, they exist). I was able to track the vessel itinerary over the last three days. Pluto came from the North Atlantic, south around the UK, and over to Rotterdam. Unfortunately, the history does not go far enough back to track where the current load originated.