It wasn’t a wind machine @Gar1eth. It’s a 2 story tall contraption spanning the entire stage with 20? arms that swing up and down (sometimes noisily). During the course of the 4 Ring Cycle operas they become mountains or waves or flying horses or just a screen to project scenery on. It’s an idea of Robert LaPage of Cirque du Soleil fame. It was very expensive idea (US$20+ million) that didn’t quite work.
https://images.app.goo.gl/bcSw8QYD1QVZMM2M9