This amber-colored tank full of electronics is actually a fully-functional Xbox (the original, not a 360). Thanks to the non-conductive cooling properties of mineral oil, a modder was able to take the guts of his old console and submerge them in a fishtank full of the stuff.
He kept the DVD player and HDD out of the tank, but everything else is in there. Heck, the CPU is actually running 10 degrees cooler than it was in its natural housing! Pretty awesome stuff.