January 25, 2007 This interesting three wheeler is apparently work from within the Audi Design Centre, but we can’t comment any more than that because we don’t know any more. The images surfaced this week when Stefan Sielaff was appointed head of design for AUDI AG, with the three-wheeler model in the foreground. Sielaff reports to Walter de'Silva, who is responsible for design in the entire Audi brand group including SEAT and Lamborghini.