The people of Pisa decided to solve the tower's lean by curving it? What do they mean by "curving" the tower?
Answer:
have you ever seen a tree that was growing on the side of a hill, and had the hill slip so that the tree leaned?
frequently when that happens, the top of the tree "curves" as it tries to grow straight up, starting with the new growth after the slide.
that's what they mean.
and that's what they did with the tower -- make some floors higher on one side than the other.
when they were building the tower, there were not many options.
in fact, in the 1900s, they tried at least once that i know of, to fix it, and made it worse.
the problem is that there is a soft spot in the ground (maybe an underground stream) that they didn't know about.
it did not become obvious until there were several stories, by which time, the only option that had was to destroy it.
(it took considerable weight to make the problem obvious.)
i don't know if there are good images on the Internet, but they did make some stories longer on one side, and shorter on the other side, in an effort to correct the problem.
unfortunately, that probably put more material, and weight, on the side that was leaning, making the problem worse.
currently, they are digging under the side that did not sink, in order (they hope) to have it sink also, and thus level the tower somewhat.
this is quite a gamble.
if there is uneven "leveling" it could deform the base, and make the entire structure weaker.
however, if they do nothing at all, it will, at some point, really topple over, so the really want to do something.
but they don't want to fix it completely.
who'd go see "the straight up tower or Pisa"?
It wasn't so much that they set out to curve it as such, after the tower started tilting, they made the walls of subsequent levels taller on the low side to keep the floors level. Obviously it did not work as the foundation continued to sink. No doubt at the time is seemed reasonable, it probably seemed impractical rebuild the foundation once several levels were already built.
Actually, due to it's popularity as a tourist attraction, it is not desired to significantly reduce the lean, just keep the tower form falling over. In order to do that, the lean has been reduced a little by removing some earth from below the high side, but no attempt was made to straighten the tower completely.
You ask; "What method from your own creativity", I think that with modern drilling equipment, removing earth from below the high side makes sense (however that is not from "my creativity" I just agree with it). Injecting cement under the low side could be another possibility, but would increase the weight so it might actually make things worse (as it did when Mussolini tried it) Driving pilings in the ground around the low side to consolidate the earth seems like a possibility too. It would seem desirable to get pilings under the foundation, but the excavating needed to to that might well risk collapse.
After three layers thay saw it was leaning and tried to fix it by changing the design.
Dumb idea. They should have just torn the damned thing down and started over. Of course, this would have deprived Western Civilization of one of its weirdest and most oddly interesting icons.
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