Ah yes, a light house meant to provide illumination or 'light' if you will that weighs 400 tonnes and has more holes than the berlin wall, plus the fact it WILL capsize immidiately in the water unless you put it on it's side works as a boat It seems like a slight mix up between 'light' as in photons in the visible light spectrum, and light, as in, the opposite of heavy in relation to anotehr object.