Of course real life has outlines. Look at these for instance:

https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd....

https://hackaday.com/wp-content/uploads/2026/05/skala_displa...

Displays & controls are thematically frames, each button/rotary has a color that constrasts from the background, and there are strong 3D clues to see what's a button, and what's a label or the background.