Paradigm Shift in terms of geometry,
This is an interesting book. Dated 1884, woven with strange and negative perception for women but anyway definetely interesting.
Every character is happy in his "limited" universe. They do not want to hear anything about other possible things. When they have been exposured such explanations they got angry!
Every character lives in his universe "a dimension missing". In Lineland every character can see a point which has zero dimension in a universe of one dimension which is lenght. Every character is capable to deduct missing dimension by thinking, dreaming,... In Lineland every character is aware of the others length which they have never seen...
It is similar in Flatland, there are squares, triangles, circles,... but all they can see is a flat line and they need to touch eachother to check the shape.
A square tried to enlighten a line but failed. They hated each other. A sphere tried to enlighten a square, first he pissed off and then sphere pushed him to other dimension.... That is a shock. The shift has happened by force! Square enlightened more than expected hence he queried sphere about the fourth dimension. This time sphere pissed off.
We belong to our universes and provided a force majeur we are capable to adopt ourselves to a new paradigm.
Unfortunately this is not a voluntary process.
I suggest Thomas Kuhn for those readers who interested in "paradigm shift".