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As last weekend’s tightrope walk shows, the site remains penetrable.

"Since the bacteria are living organisms, over time they developed a resistance, in the form of a less penetrable membrane, to traditional disinfectants," Sánchez explained.

"The inviolability of the royal harem, penetrable only by the emperor - housing glorious and untouchable women… was meant to be proof of his near divinity," Lal writes.

And then there are steel ceilings, ones that are not penetrable, no matter what skills, education or work ethic a person brings.

It also sends a message that Iran’s most sensitive nuclear site is “penetrable,” he added.