The Ferris wheel is a large wheel-like mechanical construction facility, hanging on the edge of the wheel for passengers to ride in the cockpit. Passengers sit on the Ferris wheel slowly upward and can overlook the surrounding scenery from a high position.

The most common occasions for Ferris wheels are amusement parks or theme parks, but they also often exist alone in other settings, usually as an observation deck for events.

The earliest Ferris wheel was designed by American George Farley in 1893 for the Chicago Exposition and was intended to compete with the Paris Tower built by the Paris Exposition in 1889.

The first Ferris wheel weighed 2,200 tons, could take 2,160 people, and was equal in height to a 26-story building. Because of Faris' achievement, people later called this facility "Faris Wheel", which is also known as the Ferris wheel.

The working principle of the Ferris wheel is that the motor is decelerated by a reducer to turn the high-speed and low torque into high-torque and low-speed mechanical power, which is transmitted to the wheel through an intermediate mechanism with both elasticity and strength, usually, a tire, to make it rotate at low speed.

A worm gear reducer is a power transmission mechanism that uses the speed converter of gears to decelerate the number of revolutions of a motor to the desired number of revolutions and to obtain a larger torque. Among the mechanisms currently used to transmit power and motion, reducers are used in a wide range of applications.

Ferris wheel can be divided into Ferris Wheel and Observation Wheel according to the difference in operation mechanism. The cockpit of the gravity Ferris Wheel is hung on the wheel to maintain the level of gravity; while the cockpit of the Observation Wheel is suspended outside the wheel and requires a more complex linkage-type mechanical structure to adjust its level synchronously with the position of the carriage around.

The world's largest and tallest observation wheel "Dubai Eye" officially opened on October 21, 2021, with its flywheel diameter of 250 meters, surpassing the record held by the United States Las Vegas Ferris wheel, for Dubai unlocked another world's most.

Located on Blue Water Island,500 meters off the coast of Jumeirah, the Dubai Eye (Ain Dubai) has been highly anticipated since construction began in 2013. The wheel has a diameter of 250 meters, a total height of about 260 meters, and is supported by four brackets.

The wheel has 48 high-tech viewing glass capsules, with 192 spokes, each with a length of about 114 meters, a single cable weight of about 4.875 tons, and a total cable weight of about 936 tons. 48 viewing glass capsules are customized by the French Ferris wheel equipment manufacturing company, and the value of each capsule is as high as 110,000 US dollars, with an area of 30 The cabin area is 30 square meters, can accommodate 40 people, equipped with high-end air conditioning, free WiFi, etc.