Fortune telling was not allowed in ancient times.

Pinch your fingers, in fact, is to use your knuckles to perform fast mathematical operations.

Not all fortune telling.

Through the addition, subtraction, multiplication and division of various numerology parameters, the result is obtained, and then compared with the written statement to find the numerology conclusion.

This process can be calculated with a pen on paper or a calculator, but it looks unprofessional.

Pinch algorithm is still a primary school mathematics textbook in the late Qing Dynasty and the early Republic of China. You can also find all kinds of numerology books online.

It's not mysterious