A compluvium was a space left unroofed over the court of a Roman dwelling, through which the rain fell into the impluvium or cistern. Research Compluvium
In Roman dwellings, an impluvium was a cistern or tank, set in the atrium or peristyle to receive the water from the roof, by means of the compluvium. They were generally made ornamental with flowers and works of art around the brim. Research Impluvium
 
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