Question: User: Prompt: Photorealistic 4K cinematic video of a sunny school courtyard. Two large PA loudspeakers on stands transmit continuous pure sound waves visualized as glowing translucent ripple rings. A male student walks along a straight line on the pavement. Glowing interactive floor signs appear: green "Loud" and red "Almost Silent". As the student steps onto a red marker, wave ripples cancel out. As he steps onto a green marker, wave ripples amplify. Smooth tracking camera follow shot, high physics accuracy, 60fps.