I took a moment to listen to and record some sound near the plant science building, near the ag quad. I was walking back from Bartels to North Campus at night, and there was little traffic around. For a couple minutes of my walk, the only things I heard loudly were my footsteps and a mechanical whir coming from a nearby building. The whir sounded like it had a whistling tone which fluctuated in pitch along with a deep, growling sound, which reminded me of the overdriven bass on Metallica’s Orion. The two sounds seemed to move around in pitch in unison, although they didn’t sound like they made a very clean interval, but it was close to 3 (maybe only 2) octaves apart. My phone’s camera is broken, so I didn’t take a picture.