Recently I met a Polish woman who showed me something very interesting. Apparently her mother kept notebooks which she filled with strange calculations, never telling anyone what they were for. From the way she described them to me as notebooks "filled with numbers", I at first privately thought it might be a case of graphomania, but the notebooks look far too organized and purposeful to be the scrawlings of a schizophrenic.
Her mother passed away a few years ago, having never told anyone the purpose of the calculations (she apparently used to dismiss it as "something stupid" when asked, and got annoyed if pressed). Her mother was a high level Bridge player and a trained accountant, and since the word "podatek" (tax) appears on one of the pages, it seems likely that the calculations were something to do with finance, but then you get to the pages that look like this:
It's easy to see some patterns in most of the calculations - some things are obviously sums and products, and there doesn't seem to be anything in there more advanced than basic integer arithmetic. Some of the pages feature dates, and some pages contain lists of Polish words. It's harder to see where the actual numbers come from, and so far I haven't been able to find any hint of the connection between the graphs and the calculations.
Here's a zip file containing all of the notebooks (31.3 MB).
Note: I'm posting this with the permission (in fact, at the request) of the woman's daughter. The notebooks don't appear to contain any personal information (e.g. peoples' full names or bank account information).