For over two thousand years, Chinese people have been using seals as personal signatures and official stamps. And those used by past emperors are powerful symbols today. But the art is seeming more and more out of place in the modern world.

Today we tell you about an old seal engraver who is still hanging on to the craft.

In Huangpu, a part of Guangzhou. The signboard of He Jinkai's seal-engraving business is a familiar site. As one customer says, He is known for his quality engravings that draw many people from far away.

He started his seal engraving business in 1962. And the 72-year-old still has passion for the craft.

He Jinkai said, "When I was a teenage boy I saw people carving characters. So I tried it myself with a Mahjong tile and a small knife."

That knife has remained in his hand for half a century.

After polishing and painting the material, his knife dances across the tiny square. He works without creating a draft beforehand, and seems not to hesitate a moment before starting, but after a few short minutes he's created a new seal.

In the past, seals were used like modern signatures - a necessary step in receiving salaries and letters.

But what remains of the seal-making industry is very different today. Five years ago, he bought an engraving machine that can work faster than any hand. But he still sees value in the old way.

He said, "Hand-made seals are unique. Every carving is different and hard to duplicate."

Although today, nine out of ten seals are machine-made in He's shop, He says he has never thought about letting his knife retire. Not yet.