Luckily for us, the Australian performance artist known as Stelarc, formerly Stelios Arcadiou, is not prone to sensationalism.

He only wants to transform his body into a portal on the Internet. Which is why visitors to Exit Art, a gallery in Midtown Manhattan, are being treated to a video of Stelarc’s left arm being cut up like a rare tenderloin to implant what will eventually be a Bluetooth-enabled artificial ear.

Stelarc’s video is one the more grisly highlights of “Corpus Extremus (LIFE+),” an exhibit about the wonders and horrors of “PostNatural History,” and the ways in which technology is blurring the traditional notions of life, death and identity.

In the gallery of postnatural history, for example, is a goat that has been genetically tinkered with to produce spider silk, useful for fishing line and bulletproof vests, in its milk. Elsewhere you can look through a microscope and see a movie projected on living cells, watch a movie of Russian cosmonauts examining grains of kefir, a yogurtlike drink popular in Russia, to determine the grains’ potential worthiness as “cosmonauts,” or see a mock documentary about an S&M organic farm collective.

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