You must paint it, but it is sometimes better to choose a pattern specific to the problem you're trying to solve. E.g. http://jeremykun.com/2011/06/26/tiling-a

You must paint it, but it is sometimes better to choose a pattern specific to the problem you're trying to solve. E.g. http://jeremykun.com/2011/06/26/tiling-a-chessboard/ http://jeremykun.com/2011/06/26/tiling-a-chessboard/