Manga artists guide the eye with panel shape, contrast, and breathing room....

https://highstylife.com/why-does-too-much-movement-on-screen-make-it-hard-to-follow-the-main-event/

Manga artists guide the eye with panel shape, contrast, and breathing room. Mobile casino screens face the same challenge: make the main action obvious, keep controls readable, and help text stand out on a small phone