Lynn- That's not a stupid question- theres is no such thing! When you clip and rip selvage to selvage, then you are ripping on the crosswise grain. If you clip and rip parallel to the selvage you are ripping down the length of the fabric...length wise grain. You probably would have a lot of trouble ripping the fabric into smaller squares, so it would be easier and far more accurate to use your roatary cutter or scissors (does anyone use scissors anymore?)