Would-be skyscraper structure

I was in Zürich last week and I ran across this interesting structure: Skyscraper to be expected

It seems that when a skyscraper is built in Switzerland, the population should first be aware of the expected heights. What is interesting is how they create this impression using this metal structure: a sort-of building gauge.

Why do I blog this? because I found curious to have this sort of "simulated space".