Thoughts
The problem with design is that, by definition, you are creating an experience. And yet, it is impossible for you to control every aspect of
that experience.
The most obvious example in the digital age is screen size. Designing something for multiple screen sizes is next to impossible, and yet, has to be done. How can you do that? Design a piece of art with the knowledge that the user can come along and resize the window to literally any size they want, from 50-pixels wide to 5,000 pixels? You can't. So so often you see webpages or apps that only look good at a certain resolution, and you know, oh, that's how big the designer's screen was.