A ping-pong heat field accumulates warmth around the pointer, decaying and diffusing each frame so it blooms and slowly fades. That heat is the reveal mask: a cool misty scene burns away to expose a glowing ember scene beneath, with a bright warm frontier where the heat crosses the threshold and a faint rising shimmer on the exposed layer. Hover to paint heat — when the pointer leaves, a slow-drifting source keeps warming the field so the reveal never stops.