While that is unspeakably cool, I am somewhat disheartened by the number of commenters there saying it's "destruction of property", a hazard to others, etc.
When I see these comments on HN I usually expect to see 80% of the commenters 'booing the guy off stage.' More often than not there are maybe 2 or 3 comments that represent what is referred to the 'the number of comments/commenters' with other commenters also going 'wtf' to these people.
Is it really that 'disheartening' that in any crowd there will be at least a few people with differing opinions?
Also note that while the one guy rails against it as destruction of property, he also rails against the building designers and the council for not improving the situation. His comment could be summed up as, "there were poor choices made all around."