Interactive: double-click (or hold 🌬 blow) to blow the candle out — the flame
tears sideways, dies, the wick ember fades and a wisp of smoke curls up; click the dark
scene to relight. Waving the mouse quickly over the stage stirs a draft: the flame leans away
and the light gutters. Everything that moves — flame turbulence (GPU), the drafts, the smoke's
curl and the light flicker on wax and wood — is one helix field (the flicker is a single
CPU field.sample() per frame of the same field the flame rides). Drag to orbit,
scroll to zoom.