Consider sitting deep within the hull of this cruise ship, ignorant to the outside. A leak is sprung and ocean begins to rush in. Thinking quickly you activate the bilge pump which, appropriately, ejects the ocean outside again. You note that the bilge pump has a number of settings from "low" to "high" corresponding to the rate at which it evacuates ocean from inside the hull. When the pump’s setting is ‘low,’ ocean water rises inside the hull – you feel the water’s pressure around your ankles.

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