"Our second stop during our whirlwind day in Rome was to Piazza di Trevi, dominated by its amazing fountain. Our group also had time for a gelato, and I picked up a few postcards and my commemorative magnet."
...and underneath the images...
"The main statue of the fountain does not represent Neptune, but Ocean. In fact, Neptune often has a trident in his hands and a dolphin following him. Instead, as its designer Nicola Salvi wrote, the statue is an image of Ocean, the personification of an immense river that flows around the earth and from which all streams of water derive. Ocean was the son of Sky and Vesta. From his union with Thetis, rivers and sources of water were born.
"The beard of Ocean is a symbol of wisdom and power. The wand is short and thick, similar to the ones held by Roman emperors portrayed in many ancient coins. The restless horse represents the violent strength of the sea. The calm horse in contrast is a symbol of the tranquility of the sea. The statue of Abundance holds the symbol of plenty, a horn filled with fruits and produce."
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Credit: text explaining the symbolism in the sculptures is from www.trevifountain.net/iconography.htm