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The Tower of the Winds is an octagonal marble clock tower in the Roman Agora in Athens that functioned as a horologion or “timepiece.” It is considered the world’s first meteorological station. The structure features a combination of sundials, a water clock, and a wind vane. The frieze on the Tower of the Winds shows the wind gods Boreas (north wind, on the left) and Skiron (northwesterly wind, on the right).