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If you ever go for a walk in the woods, how much attention do you pay to the way it sounds? A group of architecture students from Estonia have installed three giant wooden megaphones in the forest outside the capital, Tallinn, to encourage people to climb in and listen to what's going on around them. 21-year-old Birgit Oigus came up with the idea. Picture: Birgit Oigus's giant megaphones in an Estonian forest Picture credit: Tönu Tunnel
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