🔊The constant rumble of traffic and people brings cities to life. But is it also making us sick? The ill effects of noise pollution are now well documented, with cities declaring open war on the not-so-silent killer. More with Environment / Down to Earth - France 24 ⤵️ | FRANCE 24 English

In Belgium, engineers and designers transformed ordinary highway noise barriers into something extraordinary by shaping them like giant piano keys. These sound walls are not just visual art — when wind passes through the carefully spaced vertical panels, it creates soft, low humming tones, turning a noisy roadside into a subtle musical experience for drivers. The effect is achieved through aerodynamic spacing and acoustic resonance. As wind flows across the piano-key-shaped structures, it produc