Aquarium dealers sell backgrounds that are photographs of underwater scenes. These can be effective and attractive backgrounds, provided that the objects in the photo are 1) their normal size, and 2) appropriate to the rest of the aquarium. For example, you do not want a photo of a submarine in the background. This just looks silly. On the other hand, if the photo contains elements that can be repeated in the tank, corals, for example, you can create the impression of a scene stretching infinitely away from the viewer. Some large custom installations feature a photo background shot from nature and then duplicated with real objects in the aquarium. These are sometimes illuminated from behind the tank, creating a striking effect. Such museum-quality designs are, of course, expensive.

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