“So it’s not the muscle,” Leo whispered. “It’s the valves. The doors.”
Elara smiled. She tapped her own chest. “It’s a good question. Most people think it’s the heart beating —like a fist clenching. But it’s not. It’s doors.”
Leo mimed a slam. “ Lub. ”
“Perfect,” she said. “Your doors are doing their job.”
Elara put the stethoscope back. She listened for a long, quiet moment. The chambers filled, the valves held, the blood rushed—an ancient, invisible engine of slamming doors and fleeting silence.