It’s hard to express just how much of a change this is. For the first time ever, the tech industry is selling not just to big corporations or middle-class families but to four fifths of all the adults on earth – it is selling to people who don’t have mains electricity or running water and substitute spending on cigarettes for mobile. This means we have accelerating complexity in three ways: we go from middle class families to everyone, we go from the PC to mobile, and we go from the simplicity of the web browser, mouse and keyboard model that lasted twenty years (thanks Marc!) to these complex, multi-layered devices where everything is still changing. And this is why it’s so much fun.