SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Roman mosaic. Fourth century mosaic depicting a type of fast rowing boat known as an actuaria. The word portisculus (centre) refers to the hammer held by the ship's master to signal the rowers' strokes. Mosaics are constructed from small coloured cubes of stone and were common in ancient Roman homes of affluent citizens. This mosaic was unearthed at Medina, Tunisia.
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