PAINTING
This shows the trails of some minuscule specks of colour as they emerge from three moving bodies. Each body and all the specks of colour that emerge from it accelerate towards one of the other bodies with a constant magnitude of acceleration: the yellow specks and the body that emits them accelerate towards the body that emits green specks, the indigo specks and the body that emits them accelerate towards the body that emits yellow specks and the green specks and the body that emits them accelerate towards the body that emits indigo specks. Each speck fades as it moves.