In retrospect, it's obvious a big component of primary education is training students to be obedient "workers". For example, there are a lot of jobs where people believe they must surrender their human freedom when they're on the clock, so if there's nothing to do, they'll just sit around and stare at a computer screen or sweep an already clean floor or whatever until the clock magically frees them.
Those people have internalized a "serious" life, maybe from things like study halls. It's often instructive to lookup the etymology of a label like "serious". The day-to-day meaning of it comes from a feeling; everyone knows the feeling of being serious. Appropriately, scholars think the word comes from an ancient root word for "heavy". Being serious is the equivalent of telekinetically trying to move a heavy weight. People do that all the time. They imagine exerting their internal will-force has a real-world effect, when it has zero real world effect. That particular delusion is fascinating.
The opposite of a serious life is a frivolous or play life... not surprisingly the origin of that word is "light" as in "a light weight". Sometimes in the "fun study hall" my friends and I would get in trouble for having too much fun. For example, in one of those, we invented a game that involved a baseball made of taped up paper. I don't recall exactly how it worked, but someone would pitch, and someone would bat. The group of kids probably got too loud so we were chided for "playing". The collective idea in the school was the study hall should be in that punishment/serious mindset, I suppose.
Play and creativity go together, while "seriousness" generally inhibits creativity. My first "real" job was at a tree farm when I was 16 and it epitomized that "serious" mindset. The overall concept of that tree farm was "work is serious" in the sense that it should be simple and sort of stupid and kind of a workout and strength training exercise.
One of the tree farm tasks for the kids was to go pickup the newly cut rounds of fallen trees and process them into firewood. We'd load them on a trailer, then put them one-by-one onto a hydraulic log splitter in wood barn and break them into firewood. The firewood was piled up in the barn where it dried. People would buy the wood by the pickup truck bed, which is obviously a totally arbitrary unit, and we'd toss it into the back. When I was just 16, I could see the workflow could be more efficient, even with just the primitive tools the farm had, but the point wasn't to improve things, it was to "work hard", that is, stupidly. I only worked there for a couple weekends.
The "play/creative" mindset won out massively over my Gen-X life and the "serious mindset" people ate it on the societal and individual level. Being "serious" is a sort of self-imposed punishment. Let's return to the tree farm example for a very obvious case of creativity winning out. Over the decades since I was un-ergonomically loading rounds into a hydraulic log splitter, people build log processor equipment that automated that whole process. One guy can generate a mountain of firewood in a couple hours by loading a tree trunk onto a machine with another machine like a tractor or skidsteer.
That "serious" mindset still managed to partially infect me in spite of seeing it for what it is. It's difficult to fully embrace philosophical absurdism and be freed from all the years of training by dullards. The training should be about an ability to focus and concentrate when needed as a tool rather than merely appearing to do so, or worse yet by "obeying" some dumb ass teacher in a school setting.
