Even the best video games use clever tricks and shortcuts to make the game world more convincing or immersive. Here are more of our favorite developer illusions and tricks.
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Sources and references:

https://twitter.com/slaktus/status/711919549218689025?lang=en

https://www.resetera.com/threads/your-thoughts-on-dantes-inferno-2010.17994/page-4

https://www.gamesradar.com/the-secret-art-of-the-video-game-loading-screen-and-why-they-wont-be-going-away-anytime-soon/

https://www.reddit.com/r/gamedev/comments/9111km/so_how_is_the_mirror_in_duke_nukem_3d_programmed/