The idea of parallax design is simply an awareness of movement. More specifically, the word ‘parallax’ is used to describe the perception of distance between objects while moving along a line of sight. For example the objects nearest to you in space will seem to move quicker and more dynamically than “background” objects. So parallax is just a measurement of the difference in position between 2 points from the viewer’s perspective. Since the objects aren’t really moving it’s just a type of illusion like 2D animation.
One of the simplest ways to understand design is through example. Let’s take a glimpse into specific trends used to create parallax design features in website layouts.