Anechoic chamber at the Harvard Acoustics Research Laboratory. "An anechoic chamber is also a kind of prosthesis, serving to eliminate sound reflections in a room. Bell Labs built the first one, and Harvard's Acoustics Research Laboratory also built one.
If you ever find yourself in Revelstoke, British Columbia, Canada.head over to the attraction known as "The Enchanted Forest" and see this stunningly tall treehouse! I love this place, remember going there a few times as a kid on family trips.