In which science Youtuber Steve Mould 3D prints ring shaped troughs, fills them with lighter fluid, and shows that a small flame will circle around the ring unt

In which science Youtuber Steve Mould 3D prints ring shaped troughs, fills them with lighter fluid, and shows that a small flame will circle around the ring until the lighter fluid runs out. Then builds a ring which pulses flames into a spiral trough, and other cellular-automaton-esque traveling flame patterns.