Outdoor installation by Aram Bartholl is a fire-powered wifi router which can make PDFs on survival available when heated:
The boulder from the region Neuenkirchen, Niedersachsen contains a thermoelectric generator which converts heat directly into electricity. Visitors are invited to make a fire next to the boulder to power up the wifi router in the stone which then reveals a large collection of PDF survival guides. The piratebox.cc inspired router which is NOT connected to the Internet offers the users to download the guides and upload any content they like to the stone database. As long as the fire produces enough heat the router will stay switched on. The title Keepalive refers to a technical network condition where two network endpoints send each other ‘empty’ keepalive messages to maintain the connection.