As I've learned more about kindergarten inventor Friedrich Froebel and the series of "Gifts" he created to give form and structure to discovery based learning, I now know that these yarn drawings were product of Gift #12, some made on pre-punched cards, others make by punching points through a gridded template, as here. And, looking at these, it should not seem too surprising that Paul Klee and Piet Mondrian were both products of early kindergarten. These too feel quite akin to me to the later spatial yarn drawings of Fred Sandback. Such loveliness created through a series of small, clear  gestures. I believe will never tire of looking at pieces like these.

Each measures 4 1/2" x 3 3/4." Some wear as evident, overall good condition. Sold as a set of four.