Stock Photo - A smartphone is held up next to the installation 'Keepalive' by artist Aram Bartholl in a forest near Neuenkirchen, Germany, 28 September 2016. A WiFi hotspot is hidden in the rock, but only works when the rock is heated by a campfire. A thermogenerator then produces electricity and activates the router. Photo: JULIAN STRATENSCHULTE/dpa | usage worldwide. - Neuenkirchen/Lower Saxony/Germany

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