If you live in a busy city, you’re probably no stranger to city noise. Hearing the sounds of garbage trucks, the wailing of police and ambulance sirens and street traffic are to be expected, but the constant noise can be a nuisance when you’re looking for some peace and quiet at home.
Fortunately, you can buy yourself a bit of silence with Rudolf Stefanich’s ‘Sono,’ a noise-cancelling device that blocks out all of these sounds.
The device can be attached to windows and it is based on the opposite principle that allows flat surfaces to amplify sound. The Sono works by picking up vibrations, but instead of moving with them, it moves against them—just like a pair of noise-cancelling headphones.