Parallax (noun)

1. The difference in the apparent position of an object viewed from two different positions.
2. An apparent shift in position or direction of an object, caused by a change in the position or direction of the observer.
3. The effect of perspective that creates an illusion of depth in a two-dimensional image.

Origin:

The term 'parallax' comes from the greek word 'parallaxis' which means 'alteration'. it was first used in astronomy in the 19th century to describe the apparent change in position of a celestial object due to a change in the observer's position.

Examples:

1. The parallax of the moon as seen from different parts of the earth causes it to appear to move in the sky.
2. By measuring the parallax of distant stars, astronomers can calculate their distances from earth.
3. The parallax of the closer object was much greater, making it appear to move more quickly as the observer changed position.
4. In computer graphics, parallax scrolling is a technique used to create a sense of depth in a two-dimensional image.
5. The parallax of the buildings in the city created an illusion of depth, making the scene look more realistic.