I have built this caleidoskope, it took 3 weeks of work, and it is awsome, i love it; to me is one of the greatest things i have ever done, and this is also because of the effect this has in people.
It is amazing how something so simple, can bring that much joy.
The caleidoskope is 120cm by 1m aprox, with the whole structure and so... the truth is that it is very impressive >