You're right, indeed. It's a hydraulic gyro made by AtomLab called the Hydro Twist (www.atomlab.com/brakehydro.html).

 my friend had that done on his bottle rocket wen i 1st saw it i was like thats so stupid but its sick

 hes got a hydro giro and his front hose is routed through his head tube. looks sweet. its a good idea having it down there then he got no worries at all about cables tangeling up

 hows the hydro gyro work?

 i duno how it works exactly but its the same principle as a normal gyro jus for hyro fluid i guess. ive seen em b4 but i cant be bothered gettin mi head around them. ace idea tho

 would cost alot for a few whips and barspins lol

 so he can barspin/tail whip

 its a suicide shifter, cam mccaul runs it aswell

 Its there because when the shifter is on the handlebar, the cable stretches and shifts in the air when doing tailwhips so its hard to pedal for the next jump with a shifted derailuer in a super low gear. With the shifter on the toptube, the cable wont stretch or shift at all so pedaling for the next jump is doable, plus there is more space on the handlebar!

 __

 its because hes running a starnut in his topcap so if he ran his shifter on his bar that would be useless, he can barspin and whip as much as he wants without worrying about tangling his cables...