The stone used to hold the motor down onto the floor is traditionally provided locally, wherever the Thinking Machine is shown. In Madrid and Berlin it was a piece of stony urban rubble; in Tokyo, a rock borrowed from a museum flower bed. For the Ogaki Biennale the composer Yuichi Matsumoto, who was at that time, in 2010, a post-graduate student at the Institute for Advanced Media Arts and Sciences (IAMAS, Ogaki), took me for a short expedition to a nearby rivrer. I chose four stones and Matsumoto-san then selected one of them.
I have searched the Ibigawa and Neo rivers to the north of Ogaki on Google Maps several times but can't find this location! That small grassy island should provide a clue. Any ideas?