I designed a paper model a few years ago that was supposed to show what the future would look like, from the vantage point of the early 20th century. Basically, all the buildings would be outrageously tall and be connected with roadways and bridges.
The model turned out well but it never had the vertical height that drove home the concept. On a whim, I took my existing model and built a second set of buildings, then started stacking them in various combinations. The result is much closer to my original concept.
The original model is available here: