There are two especially inviting concepts at Frankfurt; one Japanese and one German. One is about showing off, the other is more about Chinese teenagers. What they have in common are the doors. Massive doors.
When I say massive, I mean it. Forget the i3's suicide doors, or even the biggest doors currently produced by the BMW group. The Nissan Friend-Me and the Opel Monza play in a different league when it comes to inviting passengers.