Silk is a great invention of China and its first world-famous creation. Silk products had always been the world most important international trade supplies before the industrial revolution. The documentary focuses on silk, which is merely 0.02 mm in diameter, and records with contemporary photography technology the profound influence of such a delicate tiny thread on people daily life and production in a sophisticated manner.

Natural silk is slender and elegant. Under a microscope, the two triangular cross-sections of silk are closely arranged; the hanging degree of raw and treated silk contrasts sharply; unearthed brocade of an Eastern Zhou tomb has 240 warps percentimeter. Silk not only presents a breathtaking micro-world, but also records the exquisite craftsmanship of silk makers.