A childhood belief about work

I used to believe that "work" was actually the name of a job and since every adult I knew went "to work" I was convinced that all grown-ups had the same job and worked in the same building. It never dawned on me that for example teachers were working, because I didn't consider that a job. It wasn't until a teacher at our school retired (and I learned that retiring meant "to stop working") that I found out the truth. Within a week I learned that policemen, doctors etc. were also "working".