He said "what the boxes are used to build", the original guy was talking about shapes you can make with the boxes. The replier was too: someone could stick a bunch of them together into a swastika.
That strikes me as a nice fuel/air mixture suspended in space. I would not make anything large out of them in an interior space unless they have been fire rated.
They seem about as safe as using cheap egg crate foam on the walls of a night club.
Whatever you are trying to accomplish, there's a cheaper way to do it. You can get used cubicles and furniture on Ebay and sound foam isn't all that pricey either.
The chief attraction is that they seem like fun, but just wait till the novelty wears off. I just don't see the need to spend $60 dollars on something I could accomplish with a crate.
I'm with you. I considered the possibility of getting a pack for my son. Then I had sticker shock. He'll have to just make due with empty paper and shoe boxes for his fort (a bloxes pack is available for $999?!).
It'd be much more interesting if you could build machines, rather than just structures with these, esp machines that can assemble bloxes, to make another machine.