apart from a rock,
that weighs in at 1.5 tons and has a fire lit beside it, it is how you can charge your mobile telephone when there is no electricity or wi-fi,
is actually a work of art called 'Keepalive' by Aram Bartholl, it’s a real boulder, but modified to hide a Wi-Fi router
inside that is powered by a thermoelectric generator which converts heat
directly into electricity,
so if you go to the peaceful village of Hartböhn in Lüneburg Heath
in Germany you can try lighting a fire under the rock to see how it works, I wonder if a portable version is on the cards?
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