On 14 September 2015 two black holes a billion light-years away spiralled together, and their collision rang spacetime like a bell. LIGO's twin interferometers caught the signal — GW150914 — and the Q-transform spectrogram that plotted it became the defining image of a new astronomy. This system is that plot, read straight off the instrument: a solid black-to-dark-indigo canvas, a monospace grid of Hz and seconds, and a single bright arc — indigo to blue to cyan to green to yellow — sweeping upward as the chirp climbs to ~250 Hz at merger. Data first, ornament never.