Our own resident Annastrophe mentions: The game is the same, BUT you write two or three full lines, then just half a line... fold down all you've written except that half line and then pass the paper along to the next participant.

I took part in an oil painting like that once. Each person would paint a vertical inch and lower a screen so that only the bottom few millimeters were visible. What we got when we were done was a painting with clearly visible transitions at three inch intervals.

It was destroyed in the Old Crawley Mansion Fire of 1974.