Leif Brush also created a variety of sound devices designed to make music in the forest. From AllMusic.com:  

The Minnesota Permanent Forest Terrain Instrument is a large electronic installation created in 1990 consisting of many sound devices in 400 square feet of space ... The instruments, connected through "tunable" brass and steel wires suspended between tree clusters, include The Signal Disc, Whistler, Wind Ribbons, Rainpattern Tree Filters, Treeharps Networking and Modified Treeways. 
You can hear Leif talk about the project in this excerpt from the documentary Inside the Hidden Landscape.


One of his forest instruments, the Wind Ribbon, is part of the permanent collection in The Sound Forest, a free open-air museum of sound installations in the forests of Belgium, which seems like just the right place to maintain his legacy.