Why does the gyro rotate counterclockwise and clockwise, even when the fan is turned off?

Consider a video camera, which takes pictures every 1 second. The object of taking pictures is 1 rotating the pointer, which rotates 359 degrees clockwise every 1 second. Now let's look at the record on the tape, and the information we get is that the pointer on the first film is 0 degrees, and the pointer on the second film rotates counterclockwise 1 degree. On the second film, the pointer rotates 2 degrees counterclockwise. If the motion of the pointer is judged only by the film, we will say that the pointer rotates counterclockwise at the speed of 1 sec 1 degree. But if the pointer rotates 36 1 degree clockwise every 1 second, we will think that the pointer rotates clockwise at the speed of1second 65438+.

Because of the visual persistence effect, your eyes are the camera, but you can think that your eyes take pictures every 0. 1 sec/time (the image will stay in your mind for 0. 1 sec).