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Please tear off the matte film on the shaded side of the animated gyro, and then you can take a video of the animation with your mobile phone's video function in the sun.

问题一How are animations formed? The videos we usually encounter are either 30 frames per second or 60 frames per second, which means that 30 or 60 different consecutive images are switched per second. The principle of how a gyroscope can form an animation is also based on this law.

Question 2Why can't we see the animation of a gyroscope with the naked eye: because the refresh rate of our eyes is very high, so when the gyroscope is rotating, we have already seen it turn, and we cannot see the still image

Question 3Why sometimes there is animation and sometimes there isn't when taking a picture: Because when you choose a video format with 30 frames per second, the gyro needs to rotate 30 times per second/6 (6 frames) to freeze the frame, thereby generating animation.

问题四Why must we take pictures in the sun to create animation? The previous question mentioned that it takes a still image to form an animation. So we need to talk about a single image, which is composed of aperture, light sensitivity, and shutter speed. When we take a picture of a moving vehicle at night, there is always a trail effect, because the light is too dark and the shutter speed is not fast enough. So, when we come back to the gyro, which is spinning at high speed, we must have enough light to make the smartphone's shutter meet the high shutter speed to freeze every frame of rotation.