When photographing the ferries at Edmonds, the sun was very low in the sky and was coming on to the boat at an oblique angle.  This shows up something that is not obvious about ships from far away but is really obvious when you get close to them.  Take a look at a large ship from far away and it may look like a smooth sided creation.  However, ships are constructed from plates of steel being welded together and, when you get close to them, this becomes a lot more apparent.  The individual panels are far from smooth and the joins where they are welded together are a bit “agricultural”.  Get the light on them at a shallow angle and this is pretty clear.