Behold that bonkers styling—the fluorescent stripes on the floorboards, the avant-garde high-design shell. Toyota’s Concept-i certainly looks the part of a hyper-futuristic concept car. But the real star of the show is the ghost in the machine. Its name is Yui, and it wants to be your bestie. Yui, pronounced “you-E,” is the personal assistant Toyota built into the architecture of its concept car for last week’s 2017 Consumer Electronics Show. It manifests as a