On the third day when Lin Feng set up a street stall in Panjiayuan, an antique identification system suddenly appeared in his mind.
The blue and white bowl that cost 20 yuan was resold for 1,900 yuan.
A broken bronze mirror weighing a few dollars, with the private money of a Ming Dynasty craftsman hidden under the oxide layer.
The iron lump picked up from the scrapyard for 50 yuan is the Xuande furnace given by Emperor Xuande - the third in the country.
It took Lin Feng ten years to go from a corner stall in Panjiayuan to the largest antique store in Liulichang, from domestic scavenging to recovering national treasures at international antique exhibitions.
Someone asked him why?
"It depends on your eyesight," he said.
He didn't mention a word about the system.