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They say that because cruise ships are so big you never feel the motion of them on the sea. They are apparently not sensitive enough to that motion. The ships, no matter how large, roll slowly back and forth, up and down. They pull forward. They lag back. The motion never ceases, not even in port. This motion is the clearest when you are in your cabin's bed, tossing because you're rolling. The next clearest is when you try to walk normally down a straight hallway. You can't just step; you must place your steps, and even then you will drift back and forth. The worst, however, will come when you are back on land and you're still rolling. You lie down in your hotel bed, trying to get some sleep before your early morning flight back to the ice and the dark, but you are too dizzy from the rocking, rocking, rocking of the perfectly still bed.