During Roman rule of Pompeii, homes were constructed without many windows. Instead, they had two inner courtyards onto which all rooms opened. Pompeiian homes were built with an atrium, which was essentially a covered courtyard. The atrium had a small opening that allowed rainwater to flow into a cistern on the courtyard's floor. Water was piped into the house. Pompeian homes generally were decorated with floor mosaics and frescoes on the walls. The wall paintings usually depicted subjects related to various Roman gods' activities.
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