someone's hand.... they just let go of the back wheel and move their hand quickly out of frame, when someone else snaps the pic, then grabs it again before it falls
that would be sweet though, you could turn it up in tech sections, to keep the bike more stable, and turn it down in the corners, to allow the rider to rail it
not asking for hate here... but having a gear box means no rear derailleur , no cassette , so the weight that you gain by having a gear box isant so much when you minus out so 7 or 800 grams from the cassette and derailleur.
but there still is a shifter and it's likely heavier than a 10spd x0. you're also adding a second chain. i'd be willing to bet that it's 2-3lbs heavier than a derailleur setup.
But I could lace a wheel with an internally geared hub, mated to an internally geared hub, and have something like a BAJILLION gears....Just a thought.