Inside cabins on cruise ships are somewhat depressing. Here's a plan to make them better. Equip them with flat-panel HDTV video screens. Then place HDTV cameras on the bow, stern and both sides. Tune the video panel to the camera that is pointed in the same direction to make a virtual porthole.
Why is this valuable? Well, aside from giving the passengers something to look at in high-res, a lot of seasickness comes from your eyes not telling you the same thing as the balance organs in your inner ear. It's why staring at the horizon is the right thing to do when feeling queasy. This simulated window (if aligned well with the camera) should provide some help with that.
Not having done tests I don't know if it will be necessary to have the camera be close to the screen or whether a camera amidships (not moving up and down so much) could work with a screen near the bow, or vice versa. The disparity might make things worse, and tests would be needed. One axis might work while another would not. It might also be possible to compensate for the difference by cropping the frame from a larger view, and introducing artificial motion to provide the level of horizon motion that would be seen from a window.
Of course, they could also add bright full-spectrum lights to the inside rooms (I assume some ships do) to make them more cheery.
Inside cabins sell for a lot less than outside ones, this could jack up their price. Of course the screen could also tune the other cameras, or indeed other closed circuit cameras showing public areas on the ship, or semi-public ones like the bridge during interesting times.
And, duh, they would be great for movies and other video entertainment. In fact the outside cabins might want them so they can see out the window to starboard and see forward as well! Making a few hundred extra per trip would easily pay for the flat panel displays in a short time.
How are pricepoints moving on HD cameras meant not for camcordering (with associated expensive compression) but closed-circuit work? I could see a market for this even in homes, with one's flat panel showing the view from the roof of your house, if it has a view.