30 × 42 grid · 7 mm pitch on A4 (210 × 294 mm)
drag to paint · tap eraser to lift a dab
A visitor drags a finger across the grid to place pigment dabs. On submit the pattern becomes a flight plan: one dab per filled cell, in the order a gripper-held brush would touch the paper. Example composition loaded below — clear it to draw your own.
This is where the dab sequence would hand off to goto_pose.py's
cartesian sibling once the wrist board and pigment-cup calibration exist. For now
it just proves the data shape.