Read "Enchanted Mirrors" at The Eldritch Dark:
This sonnet from Clark Ashton Smith (CAS) is clearly intended as an artistic manifesto: "These are enchanted mirrors that I bring, / By demons wrought from metals of the moon."
The language throughout is rich and gorgeous, but the closing sestet really packs a wallop:
Therein you shall behold unshapen dooms,
And ghoul-astounding shadows of the tombs;
Oblivion, with eyes like poppy-buds,
Or love, with blossoms plucked in Devachan,
In stillness of the santal-pillared woods;
But nevermore the moiling world of man.
It's as good an advertisement as anyone could create for CAS' body of work.