Or, possibly, a week later, as it was getting slightly freezing on the ground.
We started building our future house. The lot we bought from that doctor (worked in the hospital, I think he was a nephrologist(... 12 words...)) was a tad smaller than normal - 12,5 by 40m. We had decided on a 11x9 floorplan, internals still undefined, but it would have one room 4x4 by the gate, and a thick carrying wall in the middle, well, almost all the way. Because this is the day we called up a moba to pour foundations. I can't remember how I got the planks for the casing - and we needed a lot, because that's 40m of concrete wall 60cm high. Everybody needed planks then, because some time during the next week the whole area was to be recategorized from agricultural to residential land, and then whoever already had started building has practically exercised the right to build, and converts ownership of agricultural land into right-to-build on city residential land. The others would be remunerated at some lousy rate, so of course everybody wanted to have foundations poured on time, before they fly over and take shots. And the planks I got were fourth grade, the leftovers from the worst, but at least I got those, they were the last. I still have one piece of that, an irregular shape that I supplied with hooks and hung on the wall as a coathanger.
The guy on the next lot was a brother of a PE teacher from MPSŠC and they were there at the same time as we. Their foundation was a bit more diverse, but a couple of years later, when they sold just the bare foundation, the guys who bought it (Aleksa, that is) straightened that out and made a plain rectangle.
My memory is kind of fuzzy, who was there who was not, whether we did the underground part one saturday and above ground the next (most probable... so I'll stick to that). Arpi was there for sure, perhaps oma, probably my dad. And Lajči as the main majstor, with voice of authority. Not knowing him too well, I thought he was a mason; she, OTOH, was busy on the other end, so when we checked the diagonals to be equal, the rope lay flat one way, but over a mound of soil the other way... which should throw the measuring off for sure. But no, he dismissed it as "I know", and I assumed he already compensated for it somehow.
Well, he didn't. Eight years later, the carpenters who did the roof have noticed that the driveside wall is about 20cm shorter than the neighborside. We're rich with many things, but right angles aren't among them.