Since self-inserting characters in Picture mode overwrite and move point, there is no essential restriction on how point should be moved. Normally point moves right, but you can specify any of the eight orthogonal or diagonal directions for motion after a self-inserting character. This is useful for drawing lines in the buffer.
Two motion commands move based on the current Picture insertion
direction. The command C-c C-f (
picture-motion) moves in the
same direction as motion after insertion currently does, while C-c
picture-motion-reverse) moves in the opposite direction.