Chris Hefele on X: "To #playwithmath, I used some leftover PVC pipe to make a couple versions of a trefoil knot (the simplest torus knot in knot theory). https://t.co/42NYzNoBAf https://t.co/c5WjJgmBKv https://t.co/2RLpLD9n0F #trefoilknot #
![Wholesale China Wholesale Spc Flooring Wiki line Quotes Manufacturer - PVC milling machine – Qiangsheng Plastic Manufacturer and Supplier | Qiangsheng Wholesale China Wholesale Spc Flooring Wiki line Quotes Manufacturer - PVC milling machine – Qiangsheng Plastic Manufacturer and Supplier | Qiangsheng](https://www.qiangshengplas.com/uploads/PVC-milling-machine-4.jpg)
Wholesale China Wholesale Spc Flooring Wiki line Quotes Manufacturer - PVC milling machine – Qiangsheng Plastic Manufacturer and Supplier | Qiangsheng
![Wholesale China Wholesale Spc Flooring Wiki line Quotes Manufacturer - PVC milling machine – Qiangsheng Plastic Manufacturer and Supplier | Qiangsheng Wholesale China Wholesale Spc Flooring Wiki line Quotes Manufacturer - PVC milling machine – Qiangsheng Plastic Manufacturer and Supplier | Qiangsheng](https://www.qiangshengplas.com/uploads/PVC-milling-machine-2.jpg)