” When the poet ceases to depict in words what exists in fact in Nature,
then the poet does not become equal to the painter. For if the poet,abandoning such
depiction, describes with the ornate and persuasive words of someone whom
he wishes to get to speak them, then he becomes an orator and is no longer a poet,
nor is he a painter. And if he speaks of the heavens he becomes an astrologer and
a philosopher,and a theologian when speaking of the things of Nature or God.
But if he should return to the depiction of anything,he would make himself equal
to the painter if he could satisfy the eye with words in the same way that a painter
with brush and colour makes a harmony to the eye in an instant,like music does to the ear

Leonardo da Vinci, anatomical studies, The Queen’s collection at Windsor Castle volume two
[x]197 verso, p.772