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As was the case at the paper mill in Rome, the facility was dominated by a single, tremendously expensive machine — here, a multimillion-dollar corrugator, into which the containerboard was fed at a velocity of 1,200 feet per minute.

“Fluting happens at the top,” McDaniel said, indicating a series of whirring cogs on the corrugator that folded the paper into tiny creases — origami at industrial scale.

All three layers are sealed together with cornstarch, which is cooked to boiling and introduced via the corrugator’s dosing tank.

He lowered his brow, using his depressor glabellae, depressor supercilii, and corrugator.

But that often has the unintended effect of you flexing this particular muscle, the “corrugator supercilii.”