I imagine a future with no waste; material innovations have already become exponentially more vast, and I do think the future needs to be cradle to cradle. If designed properly, one product could be used for many years before needing to be recycled, or its components reused.

I know it's a cliche, but I see myself as a citizen of the world. I was brought up in Switzerland by German and Turkish parents but I've very much grown up in San Francisco. I have a European sense of aesthetic, but I'm also deeply steeped in the notion of change and entrepreneurship that is associated with Silicon Valley.

Design certainly has a cosmetic, aesthetic aim. It always aims at making things beautiful. But relevance is just as important. I often say, 'If it isn't ethical, it can't be beautiful. But if it isn't beautiful, it probably shouldn't be at all.'

Everything has yet to be invented. I never say 'green' - I say 'greener.' It's greener simply because this is a continuum of change, improvement and discovery.