The H4 Metropolis is a piece equipped with a light source. Under the rider at 6 o’clock, HYT has concealed two LEDs. Once activated, they flood the entire dial with blue light. At night, the green fluid is energised by this light source, becoming perfectly visible. At the same time, the wash of light flows into every nook and cranny of the calibre, literally bringing this skeleton architecture to life, and defying the laws of watchmaking.