When I look at the quilt top left for me in the 70's, by my DGM, I am so amazed by the accuracy. I don't think it is just the rotary cutter that makes such a difference. There are so many convenient tools that we use that Grandma didn't have. Accurate, easy read rulers, our wonderful machines and so many of the other tools I often wonder what she would say if she could come to play in my sewing room.