Forest Megaphone, Estonia

"Architecture can also amplify the natural noises around us. These wooden ‘Ruup’ megaphones in Estonia’s Võru County were constructed in September 2015 to harness the sounds of the forest. Designed by students and planted amongst the trees, the ‘bandstands’ vary in size and form but, at 3m diameter, they are the perfect size to climb into." -https://thespaces.com/10-buildings-with-extraordinary-acoustics/