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In the below sentences, I am not sure ❶ what is the meaning of "most itself," and ❷ why there are't 'the' before "most interesting," and "most itself."

If the sentence is okay without 'the,' ❸ is the sentence still proper without 'the' before most beautiful, or ❹ is 'the' before most beautiful is parallel with "most interesting," and "most itself."?

Help me with these complex sentences.

If these cramped question bomb is in violation of this site's question rules, please just help me with ❶ question.

Metaphor shakes things up, giving us everything from shakespeare to scientific discovery in the process. The mind is a plastic snow dome, the most beautiful, most interesting, and most itself, when, as Elvis put it, it's all shook up. And metaphor keeps the mind shaking, rattling and rolling, long after Elvis has left the building.
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1. "most itself" means "in its most natural state".

2/3/4. "the" is optional before all of "most beatiful", "most interesting" and "most itself". The author has chosen to put a single "the" at the start, which kind of serves for all three. If you wanted to, you could write "The mind is ... the most beautiful, the most interesting, and the most itself..." or "The mind is ... most beautiful, most interesting, and most itself...".
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Thanks, Mr Wordy.
Thanks for your sincere help.