In the evening, I see at the assembly site the chief of the shop and a couple more people spell over the installation that persistently does not want to assemble properly. Experiencing the craving for puzzles, I take a meter and join the consilium. I find a wrongly made detail because of which, actually speaking, I report the city, the people, realizing what it is about, come up with ways to correct it... and here it comes to me, that is precisely this detail I made...