Exposure07 on Instagram: "South Korea has implemented rain-activated street art using special hydrophobic paint that remains invisible when dry but reveals colorful designs when wet. The technology works through water repellence, treating areas that stay dry while surrounding concrete darkens from rain, creating contrast that outlines hidden murals, patterns, and messages. These temporary artworks appear on sidewalks, staircases, and plazas, featuring flowers, animals, geometric designs, and che