H. P. Grice and Triton

The Tower of the Winds on the ancient Greek agora in Athens once bore on its roof a weather vane in the form of a bronze Triton holding a rod in his outstretched hand, rotating as the wind changed direction. 

Below this was a frieze adorned with the eight Greek wind deities. 

The eight-metre-high structure also featured sundials, and a water clock inside. It dates from around 50 BC.