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I haven't heard any explaination for the pools in many houses. However, from my own observation, it was for receiving and reflecting the sunlight from the skylight on the roof, as they only place the windows on the ceiling. But imagine, it could be a beautiful decoration as well.
I assume it is a body of a slave from the location it positioned. It's near the tombs and for some reason it was not allowed to approch. However, as I told the staff there that it would be a big shame of my trip if I couldn't see it, he laught and said "OKey, come and see, they are original."