For the past year the two balloon project creators from America have travelled to cities like New York, San Fransico and Paris bringing an unusual bird's eye view of the cities to youtubers worldwide.

Their equipment is pretty basic because there's no guarantee they'll get it back: It's just 40 helium balloons and a camera costing around 50 euros. In fact their latest mission in Prague was thwarted by a tree!

Each flight is a new adventure and a unique piece of street theater into the bargain.