As part of their latest marketing campaign, the programmers at BMW->ke178 have released an interactive application designed specifically for the iPhone and iPod Touch promoting their new Z4 roadster. The BMW will compete with future Porsche Boxsters and Mercedes-Benz SLK convertibles. The app is inspired by BMW’s “An Expression of Joy” campaign and lets you build a Z4 and then drive around on a blank canvas using the Z4’s tires as paintbrushes. There is also a section that elaborates on the history of BMW’s art cars of the past.

The application is available to download on iTunes for free.

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