[WilliamTheArtist]

That is usually the route styles take. Simple basic at first, then it grows to be ever more intricate and organic (in later parts of this stage the elements cover everything, becomes "gaudy") , then the style "fractures" (using pieces of the evolved style framing blank spaces), then a new style forms.

You can almost see that with the "curved spire" form. First you saw simple glass skyscrapers with a bit of a twist, then you saw them twisted even more, and the latest example is the very twisted and organic looking Chicago Spire.

Whats interesting is that it appears to me that there are at least 2 general styles and a style that mixes the two. There is the box form with different variations of sharp, distinct linear boxes and rectangles.. then there is the curvy, sensual form. They could both continue to evolve and become more intricate and organic. Will be interesting to see.