Drag to orbit, scroll or pinch to zoom. Slow the clock down: at 1× real time a 33 ms pulsar spins 30 times per second.
Pulse as seen from your camera angle: the beam sweeps past once or twice per spin. The marker shows the current phase.
Light is traced along true Schwarzschild null geodesics (u″ + u = 3u²/2 in units of rs), per pixel. Colours are false-colour: the real surface glows in X-rays. Gravitational redshift and Doppler beaming from the star's spin are applied to the surface light.