Why is the Audi A2 considered a pioneer in automotive design?

I've heard that the Audi A2 was a revolutionary car in terms of design, but I'm not exactly sure what sets it apart from other cars. Can you explain its significance?

The Audi A2 was one of the first cars to use a lightweight aluminum space frame, which significantly reduced its weight and increased fuel efficiency.

In addition to its innovative design, the Audi A2 also featured a futuristic interior with advanced technology such as a built-in navigation system.

The Audi A2 was also praised for its aerodynamic shape, which not only improved its performance but also helped reduce emissions and improve fuel economy.