Maserati Boomerang Styling Prototype, 1971, by Italdesign. Presented at the Turin Motor Show in October 1971, this was Giorgetto Giugiaro's non-functional epowood model for the car that was presented 6 months later as a fully functional concept (in silver) at Geneva.
Mazda Iconic SP Concept, 2023. A prototype sports coupé powered by a 2-rotor rotary EV system that can run on hydrogen but also has an all-electric mode. The combined output of the hybrid powertrain is 365hp and it can also be used as a backup power source and supply a family with enough electricity for more than a week. Presented at the Japan Mobility Show, the high output generated by the two-rotor rotary EV system and the weight distribution of around 50:50 are said to "achieve excellent driving performance" but no word of when we might be able to buy one.