A living calligraphy brush: particles are continuously reborn along the stroke path, scattered with curl-noise drift, and fade over ~2.5s so the paint stays liquid and alive. A speed-driven pressure tapers every gesture at both ends and the hue shades slowly along the stroke; when the pointer is idle a virtual calligrapher writes sweeping S-curves and loops so the tile is never empty, and real pointer movement takes over seamlessly.