I have a kid in middle school, and he has a tablet. These things are often pushed as "educational". Pop quiz: you walk by, and you need to determine, within a couple of seconds, if what he's doing is actually educational. Here's what you see:
lots of graphics, whizzing around the screen
-or-
black alphanumeric characters against a white background
Now, you don't actually know, but generally speaking, the second is a better indicator than the first.
I realized this applies to my own work as well. There are parts of my job that I consider extremely useful to the world, and parts that I really gotta wonder about.
If I'm looking at green or white alphanumeric characters against a black background (easier on the eyes), I'm probably at a UNIX prompt, writing code that is doing something very analytical, or writing SQL. If I'm looking at graphics whizzing by, I'm either trying to figure out how to get a drop down to repopulate with the right thing pre-selected in the latest javascript framework, or, worse, I'm so irritated with javascript frameworks that I've decided to browse the web.
Again, it's not a guarantee, but I'm starting to consider a very general guideline: if you are looking at symbols and alphanumeric characters, the odds that you are building something of lasting value is much higher than if you are looking at things with elaborate UI elements.
It's not 100%. My kid could be watching Citizen Kane and developing an interesting critical point of view. He could be reading 101 fart jokes. It's not a perfect match. There are worthy and unworthy things on both sides.
But as a general rule, for culture and career - if you're looking at plain text, that's a good sign.