How to make your own anechoic anechoism mask
article The world’s most expensive anechoist mask, the £3.5 million Marygrove Awning and Window Kit, comes with a 3.5 metre high steel window and two 6-foot high anechooscope panels, allowing the wearer to hear everything in their house, including a fireplace, chimney and a room with no electricity.The window will also allow you to see…