My uncle, who had little formal education, became a carpenter, and he was a great builder. Not pyramids or giant towers, but anything he built lasted and most of it still stands. It was he who showed me how to measure and cut a piece of wood of unknown length into three, four, five, etc., equal-length pieces with out a measuring tape. I have given the same 'problem' to some folks who have degrees in this and that, and seldom have they been able to 'solve' the problem. There are many 'secrets' buried in time (some of my grandfather's card tricks come to mind) that indicate our ancestors may have been one helluva lot smarter than we've ever given them credit for. That too means that just because we don't understand it is no reason to think our predecessors didn't understand it, whatever 'it' is.

BM