[flickr video=5412015245 secret=a333da585b w=600 h=338]
Ranjit Bhatnagar writes:

For all four years of the instrument-a-day project, my noisy refrigerator has plagued me: I have to unplug it whenever I record a new instrument at home. Well, today I exploited it.

Materials: refrigerator noise, filtered by resonant tin cans.