This takes me back to the days before the websites. I had no idea where to expect to find levelling flush brackets (NPFB). I got into the habit of looking at all prominent buildings and bridges for them. My NPFB bags had made it into 3-figures before all the levelling line information became available.
However, at times others in my company had become aware I was seemingly looking at everything, often without knowing what I was actually seeking.
With trig pillars, my addiction to them now goes back over thirth years. It was the flush bracket number groups in my local hills that started me off. When these FB number all went into the public domain, I thought I would no longer need to venture out to the trigs. Wrong, I am still visiting and revisiting our concrete friends when time and weather permit.