Trifles mentions the making of a knotted quilt several times in the play. I've never seen a knotted quilt, so I was asking myself "What is that? This tutorial answered my question and showed how to make a knotted quilt.
How to Free-Motion Quilt on a Regular Sewing Machine
You can add beautiful texture to your quilts without investing in a specialty machine: Two things are needed to perform free-motion quilting: The feed dogs need to be disengaged. A free-motion quilting foot needs to be used.