While parallax effects can make websites feel more interactive and engaging, it’s important to note that excessive movement within parallax effects can cause harm for those with vestibular disorders. This visual technique creates an illusion of depth which leads to a faux-3D effect upon scroll. Parallax effects involve a website’s background moving at a different speed than the foreground content. Parallax scrolling is a popular trend in website design because it can make a design feel more exciting or immersive.