Wall Water Features

Don't know what this home interior feature is called?

I have no idea what this design is called. Let me describe it. It seemed to be very popular during the 60s or 70s. It's like a 'hole' in the ground...(almost like an indoor pool without the water). Here's an example: http://img707.imageshack.us/img707/4953/home11.jpg Anyone have any idea what the name is for this feature? :)

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