Remove the altered tape, there is a tortuous circle inside, weave the tape into a long circle, and pierce the long circle with a pen tip. There is a small hole in the middle of the zigzag circle in the altered tape. Insert it with a long circle, then make a circle with a piece of paper, stick them together vertically, and insert them into the small hole of the zigzag circle to play.

Gyroscope is the earliest entertainment tool of Han people, also known as sudra, which is called "Gan Le" in Minnan and "ice drift" or "beating an old cow" in the north.

Wuqiao area in Hebei Province is called Bo. The upper half of the shape is round and the lower half is pointed. It used to be made of wood, but now it is mostly made of plastic or iron.

When you play, you can wrap it with a rope and pull it hard to make it rotate upright. Or rotated by the elastic force of a spring. The traditional ancient gyro is roughly an inverted cone made of wood or iron, and the game is split with a whip.

A rapidly changing gyro model. In physics, gyro is a typical model used to describe the dynamic balance of objects. It has some physical characteristics, such as fixed axis, precession and gyro effect.

A gyro is a rigid body that rotates at high speed around a fulcrum.

Gyroscope (gyro; Gyro) refers to a symmetrical rigid body with fixed points and rotating around the axis of symmetry at high speed in engineering. Its axis of rotation is called the gyro spindle. Because of the different supporting forms, rigid body shapes and mass distribution, the types of gyroscopes are also different. Gyroscope has some special dynamic characteristics because of its high rotating speed.