A trail-accumulation buffer where an autonomous pen traces one stroke per frame, and the display folds every pixel into a single fundamental wedge with n-fold rotation and mirror symmetry before sampling it — so a stroke drawn once blooms into all sectors and an intricate mandala continuously draws itself while the old trail slowly fades. Jewel palette with additive glow; drag to draw (mirrored into every sector), scroll to change the symmetry order, and press to clear the plate for a new mandala.