They modeled the pieces after Chinese coins with square holes in the middle. The holes allowed people to string large amounts of coins together. In general, they would add 100 coins per string.

Challenge a friend to pass a 20 cent coin through a piece of paper with a 5 cent hole in it … without tearing the paper! When their frustration reaches a satisfactory level, show them how it’s ...

However, researchers can still tell that it was an ancient Chinese circular coin with a square hole. Liu told the Global Times that no matter where the coin was minted, it is clear that the design ...

The one confirmed Ban Liang coin had a diameter of 2.3 centimeters and was 1 millimeter thick. The square hole in the middle measured 7 millimeters on each side. The characters for “Ban” and ...