![](http://mathforum.org/sketchup/BuildingPerspectives1.png)
You show only certain views of the model (front, left, etc.), and compile enough data to figure out which buildings have which height.
![](http://mathforum.org/sketchup/BuildingPerspectives2.png)
It's a little like Sudoku, but much more colorful! It's free, so check it out.
Anyone can design anything in 3D! www.3dvinci.net
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