Live cameras connected to the Web can be either incredibly fascinating or amazingly dull. What do you think of a Web cam aimed at a blank wall? Or inside a refrigerator, aimed at the door? Bypassing the absurd, I’ve assembled a virtual aquarium trip, visiting whales, sharks, a kelp forest and a coral bed. All these images are live and some are only visible during daylight hours, so I’ve noted the time zone of each site.