Kong Qingsi, a 46-year-old craftsman from Liaocheng City in eastern China's Shandong Province, impresses visitors with his special skill of engraving QR codes on stones. /VCG Photo

It takes him two days to finish a QR code, which is functional. When it’s scanned with smartphones, users will be taken directly to the source page, as with an ordinary barcode. /VCG Photo

Also impressive is his engraving on light bulbs, as Kong can carve intricate Chinese zodiac images on to thin glass of two to three millimeters. /VCG Photo

As a farmer, Kong started to follow his engraving passion in his 20s, when he worked in the fields during the day and engaged in his hobby at night. /VCG Photo

After years of effort, he has now attained a high degree of skill. /VCG Photo

But his tools are far from fancy. A hammer and cutters are all he uses. /VCG Photo