Ingenious Puzzle Rings were invented in the 30s by Ruan Liuqi.
One of the most famous puzzles is the Chinese ring puzzle.
The earliest description for Chinese rings dates back to the 16th century
and is from Yang Shen, who described them in Dan Qian Zong Lu.
The Chinese rings are usually made of metal.
In the 18th century many Chinese rings, which were destined for the export to England,
were carved of ivory.