Every time I read about compatibility layers, I flash back to this passage:<p><i>Toilets in modern water closets rise up from the floor like white water lilies. The architect does all he can to make the body forget how paltry it is, and to make man ignore what happens to his intestinal wastes after the water from the tank flushes them down into the drain. Even though the sewer pipelines reach far into our houses with their tentacles they are carefully hidden from view, and we are happily ignorant of the invisible Venice of shit underlying our bathrooms, bedrooms, dance halls, and parliaments.</i>