Yuichi Matsumoto looking for a stone for the Thinking Machine.

photo of the Ibigawa river
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?
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