The way I read it, "of human thought or form" modifies "all", so it's talking about all objects of human thought or all things of human form. "hues" means colours (here used figuratively).
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RubenadriaanAnd does "With thine own hues" mean that it's autonomous and not to grasp by the mind's eye of human?It's just saying that the spirit of beauty shines with its own hues (colours). The exact visualisation of this is within the reader's imagination, but I don't personally see any implication that humans cannot perceive the effect, if that's what you