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And rare enough to be the unicorn that has commissioned this painting! But is he merely a pony-boy? As befits her name, this portrait shows New York as equestrienne, in jacket, gloves and breeches, training her pony-boy at a warm exotic location, maybe a hacienda.
Surely this one is a unicorn? He is harnessed in a bizarre horse-head costume and ready to pull her pony-trap, with another just to the side.