I came across this at the street. Never studied this system before. I think I have seen parts of that system that is a bit Meccanno / Open Structures like in the DIY Store. I really like it!
UPDATE: I found out more about it. I saw it in the Bauhaus DIY Store in Germany. And here is a website about it (not all elements form the pictures below though). I was talking to someone working in the store and the guy said, the system is patented. But it is very old (20 years at least) also, so the patent should be gone, at least quite soon.
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yes, this is also modularity 
