30 × 42 grid · 7 mm pitch on A4 (210 × 294 mm)
drag to paint · eraser lifts a dab
Drag a finger across the grid to place dabs of paint. Submit it and the arm paints it twice: one sheet stays on the wall, one is yours to take home. An example is loaded; clear it to start your own.
Demo mode: no arm behind this page. Draw and submit to see how it works, but everything stays in this browser.
Stand in front of the arm and it will find your face, take one photograph and paint that instead. Same queue, same two copies.