The poet John Keats once wrote (in his poem "Ode on a Grecian Urn"), Beauty is truth, truth beauty,---that is all Ye...

The poet John Keats once wrote (in his poem "Ode on a Grecian Urn"),

Beauty is truth, truth beauty,---that is all
Ye know on earth, and all ye need to know.

By contrast, Plato (in The Republic) warns of poetry's power to make a falsehood seem true, by beautifying it.

What, then, is the relationship between beauty, as achieved by the artist, and truth?