About a year ago I actually build a tool to build these 3d models in the browser! You can add elements in a grid (stacking multiple on top of each other), and move them and resize them. It's a little painful but quite fun to see the result!

http://tilt.jlongster.com/

A public plaza with a blue opera-house and a reflection pool bathing its own image.

http://i.imgur.com/ROT7Hf9.png

Some complex sites already look like a megalopolis with tons of skyscrapers.

Credit to my coworker Shane Riley for making this joke last year: https://news.ycombinator.com/item?id=4640843

This is either completely idiotic or genius, I can't quite work out which.

Now I just need this beamed direct into my brain and Gibson will have been right all along with cyberspace.

This got me thinking of a webpage as a city with streets, hills and other topography stuff

Something like this can be used to create easter eggs in websites...

Thank you, sir, for bringing some needed humor to the evening.

well has been there for a while now..but as a web developer i tried to use it but never able to use it..

Minecraft using this anyone?