I thought oh no, your quilt is dented????? lol lol Anyways, i have so much trouble figuring out why people always talk about their rulers slipping? I'm not being dumb, i just dont get it, and not being sarcastic at all, i really am asking? The reason i don't get it, is because i have never used a heavy plexiglass quilting ruler. Is it the size and weight of the ruler that makes it slip so much??? The reason i am wondering is because i dont have this problem at all. I can't afford quilting rulers, and refulse to pay that kind of money if i could afford it. I don't need a big heavy ruler with lines on it, because my cutting mat has all the lines i need. I just use a plastic 16" ruler from the dollar store. It is very lightweight and very flexible, so because it is flexible, when i press down on it, it presses right down into the fabric, and takes very little strength to hold it still. All i did was put a small piece of masking tape at either end of the ruler to stop any extra sliding.