South Korea has introduced a clever and uplifting form of urban design: rain-activated street art that remains invisible on dry days but bursts into vibrant color whenever it rains. These artworks transform gloomy, rainy streets into bright, cheerful walkways—turning bad weather into a reason to smile. Important Details: • Artwork is created using hydrochromic paint, which becomes visible only when wet • Designs range from flowers and cultural patterns to characters and uplifting messages • Help