Seventh and eighth graders have learned the basics of drawing Celtic Knots. Through trial and error, students learn the fundamentals of how a knot can occupy a given space, how to create barriers, how to loop ends, how to explore freeform designs, and how every knot winds up self-correcting to an over-under pattern. Students have been inspired to spend break/snack time in my math classroom to design new knots, improve old designs and share what they have created.