Kagerō, also known as "heat haze," is a natural optical phenomenon that occurs when layers of air at different temperatures create a distortion in light. This effect is often seen on hot days, particularly over asphalt roads or sandy surfaces, where the heat causes the air above to shimmer, making it appear as if there are ripples or waves. In Japanese culture, Kagerō is also associated with literature and art, symbolizing fleeting beauty and the transient nature of life. It is often depicted in poetry and paintings, reflecting the idea that just as the haze is temporary, so too are moments of beauty and joy.