Laptops could use a little sexy back. For the past few years, tech companies have been focused on tablets and smartphones, and in the meantime, a simple clamshell laptop has been relegated to workhorse status. You use it to type blog posts on planes, not to glimpse a vision of the future. Apple’s Macbook is a curiosity in a company now defined by the iPad and Phone. But today Google unveiled the Chromebook Pixel, a premium, touch-screen laptop that’s betting we’re not in the post-pc era yet.