a resemblance to a natural cave. Deliberately rough stones might be used--Pliny the Elder noted that pumice was often used to give the appearance of a cave. Water was a much-desired feature; at least a trickle, often flowing over the rocks to make them glisten.

Mosaics

Nymphaea were important in the architectural movement of mosaic from floor to walls and ceiling vaults in the 1st century. Initially they were often decorated

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