The "big circle ride" is most commonly known as a Ferris wheel, named after George Washington Gale Ferris Jr., who designed the first modern version for the 1893 World's Columbian Exposition in Chicago. In many parts of the world, particularly the UK and Australia, it is also referred to as a "Big Wheel." Large-scale, high-tech versions found in major cities—like the London Eye or the High Roller in Las Vegas—are often called "Observation Wheels" because their capsules are motorized to stay level and are intended for sightseeing rather than the "thrill" of a traditional carnival ride. There are also specialized variants, such as "Eccentric" or "Sliding" wheels (like Pixar Pal-A-Round at Disney California Adventure) where some gondolas slide along internal rails as the wheel turns. Regardless of the name, the basic design remains a rotating vertical wheel with passenger cars attached to the rim, providing a slow-moving, high-altitude perspective of the surrounding landscape.