All is calm in the warlordï¿1/2s palace, and the artistï¿1/2s apprentice Chuan sits with his friend Jing Jing, watching the sunset, when an invading army approaches. Jing Jing comes up with an ingenious solution using Chuanï¿1/2s knowledge of calculating area as well as his handmade paper and ink to frighten the troops into leaving.