Top principle: 1. When the gyro is rotated by force, the sum of the centrifugal force in each direction is balanced, so the gyro can temporarily stand on the shaft end to maintain balance, and then it is affected by air resistance, ground friction or the center of gravity of the gyro and other factors to make it rotate The strength gradually weakened, and when the power of rotation disappeared, the top would fall down as it swayed left and right. 2. When an object presents a state of perpetual motion for the movable and perpetual motion for the static, it can be called balance. 3. An object can be in a state of equilibrium in many situations, not only when it is stationary, but also when it is moving, including the movement of stars. Some equilibrium states can last, while some are only short-lived. 4. When a mechanical system is under the action of several forces, if the magnitude and direction of the resultant force are zero, and the sum of the moments of each force to any point is also zero, the mechanical system is said to be in equilibrium. -We believe that optical illusions are a unique way to bring excitement to anyone. -A piece of dynamic art that invites you to transform it from a precisely designed static shape into a hypnotic optical illusion. -Each globe has a rotating base equipped with high-quality bearings, which can rotate smoothly and lastingly. -There is a running-in phenomenon at the beginning (noise, not long rotation time).