How German artist Tobias Rehberger is disrupting the art world – stripy cars, talking skyscrapers, wartime dazzle patterns, and lots of brands …

• The multi-medium German talent likes to examine our preconceptions about what art is, who does it and how it differs from design – but some question whether his work is art at all
• From his recent Frieze London show to redesigned Volkswagen Beetles and ‘talking’ AI-controlled towers on Shanghai’s Huangpu River, the Golden Lion-winner tells us what really counts