The EO by DFKI (Deutsche Forschungszentrum für Künstliche Intelligenz) has been conceived as an electric commuter vehicle that can lengthen itself and lower the profile of its passenger compartment when it's time for fast driving, then shorten its wheelbase for tight-turning urban driving. Also, it can toe its tires in as much as 90 degrees, letting it rotate in place or drive sideways for painless parallel parking. But its main party trick is that it is designed so that a number of EOs can link to each other while in motion to form platoons or "road trains", in which they circulate together, sharing their combined battery charge. When linked, the cars would be autonomously driven, giving control back to the human driver when one leaves the formation. This is all still in development and so far has not been demonstrated for real, but I hope they make it there! The puzzle car is the first version, presented in 2012; an evolved second version (which I won't show here) was presented in 2015.