Back in May last year I did a roundup of the Most Unconventional Umbrellas seen here on YD. I wish I had stumbled across the Air Umbrella then, because it’s the mother of unconventional designs! Imagine an umbrella with no canopy!The barrier between you and the raindrops is a sheet of steady air that is blown out by this hollow pipe. Physics and a lot of engineering stuff is clogging my brains to accept this design, but if I put these dark clouds of doubt out of the way, we may have something in this concept. Think about it!