Horse

My hard, formal dreams will know just how to ride you,
My destiny in a gold chariot will be your handsome driver,
Who will take for reins, drawn in tight frenzy,
My verses, paragons of all poetry.

Lauren Shakely

This sounds like a statement on the art and craft of poetry ...

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The depicted hores is Pegasus, the Poet's Horse:  The myth of this horse, its rider: Bellerophon, and the link with the Muses were still quite common pictorial themes in Apollinaire's days, e.g. the symbolist etcher/painter Odilon Redon. Just two examples: