Quick links:
Louis H. Kauffman and his knot magic I&II
Jozef H Przytycki 's 2-dimensional spell
Virtualization of math by 3blue1brown
《周礼·地官·保氏》：“养国子以道，乃教之六艺：一曰五礼、二曰六乐、三曰五射、四曰五御、五曰六书、六曰九数。
I am a member of USA Archery(for anyone who pays $50 annually). I play barebow(光弓) and Chinese traditional bow(传统弓). Both bows are known for rapid shooting and instinctive aiming. Here I share one of my best shooting for 18meters:
