Well, spheres actually - specifically AirSpheres.
I just watched the world's first (okay, second technically) flight of this Zorb-in-a-chimney concept and it looked, well...wrong.
The concept is deceptively simple: take one eight-foot beach ball, the kind people like to roll down hills, and stuff it inside a vertical wind tunnel. Get a few people to climb inside, crank up the power, and watch as they rattle around at the mercy of the wind, much like...a ball in a vacuum cleaner.
And the entry/exit hole looks like a massive, crimson sphincter. The Freudians are going to have a lot of fun with this.
At first glance it seems like a strange idea. In fact, at second and third glance it stills seems like a strange idea, and by the fourth or fifth it doesn't look much different.
But the people climbing out did have smiles on their faces - albeit slightly wobbly/forced smiles. So perhaps this could be The Next Big Thing.
You heard it here first, friends.