Skin - as above so below

"As above, so below" is a popular modern paraphrase of the second verse of the Emerald Tablet (a compact and cryptic Hermetic text first attested in a late eighth or early ninth century Arabic source), as it appears in its most widely divulged medieval Latin translation:

Quod est superius est sicut quod inferius, et quod inferius est sicut quod est superius.

That which is above is like to that which is below, and that which is below is like to that which is above.