Among the design concepts set for a bow in Tokyo later this month is this quad spectacle. It's the Yamaha Tesseract Concept, and it shows what can be done when a team of mechanical engineers lock themselves in an antechamber built during the feudal Azuchi-Momoyama period, with nothing to eat but miso soup and grilled bananas. Or so it seems. The V-Twin powered four-wheeler is of similar width as a standard motorcycle. And like the Piaggio MP3 three-wheeled scooter, it locks out the lean mechanism when parked. It's like the answer to a question unasked. [Autoblog]