if you put 2 little square mirrors side by side -tape them together on the back.. (or the one that they sell esp for this) on the fabric, you can actually see what the hexagon designs will look like after they are cut... and you can move it around the fabric to see if you like the different color combinations that you can get out of the fabric. Helps with deciding if the fabric will work well for the blocks you want before you buy it and cut it up.