On reflection there's something seriously amiss with this ships internal organisation. I understand very well that people can stagger and fall over, but not furniture, particularly a piano. Every ship I ever sailed in (on) the furniture in the public rooms had "tie downs". Sometimes a chain, sometimes a nicely tasselled bit of braided rope. All fixed in a set location. Generally only used when the ship was expected to bounce around a bit, otherwise everything could be moved around as people wished. To tell the truth, it's quite good fun to be sat on a free moving settee never quite knowing where your'e going to end up! But not as a paying passenger I guess. So in this example the ships organisation must be held at fault. BY.