Disney Cruise Line is trying to upgrade its windowless interior cabins with a new feature: the virtual porthole. High-definition cameras perched on the exterior of the ship will broadcast real-time video to the circular monitors in the cabins. From a design perspective, its pretty clever, and I could imagine other cruise lines following suit if this is successful.Some airlines already offer a camera pointed forward and/or downward on the inflight video.Perhaps this is just the logical extension.