I dreamed the city's water pipes were singing

I was standing on a rooftop at dawn, and the entire city was humming — not with traffic or voices, but from the old underground pipes. I could hear it in my bones, like a low C chord held too long. One pipe broke open near me, and instead of water, it poured out light that smelled like wet concrete and old books. I reached in and pulled out a single cable, labeled 'Redundancy - DO NOT TOUCH'. When I looked up, the sky was made of server racks.