The Lexus hoverboard is real, folks. It’s not computer-generated imagery you’re looking at, and it’s not smoke and mirrors. In fact, what looks a lot like smoke emanating from below the Japanese luxury brand’s hoverboard is actually caused by the liquid nitrogen required to keep the ‘board’s insides cool. How cool, you ask? Put it this way: liquid nitrogen freezes at -346 degrees Fahrenheit. Ice cold, baby.