[Art]

If you consider that those four circular units each house 19 motors and propellers!

I think I saw four blocks of 20 LiPo batteries (possibly more). While extremely smooth and maneuverable I think it only has about 10-15 minutes of flight time. Then there's the issue of safety. Sure it could go way higher but would you want to, without some sort of safety option?

Still, it's very cool when some people can create unusual and creative things.