The design of the search page on Google.com is one of the most iconic in the Web's history, but it's in the midst of major changes. Google has redefined itself with Google+. Its notion of Web search as an index of pages has grown to include people, places and things. In addition to the search box, the page now has a share box . It takes great design to introduce all these new features and interactions to Google's hundreds of millions of users.

At the same time, smartphones and tablets are changing the way users interact with the Web, and Google has to make that leap along with them. It has to strike a delicate balance between simplicity, consistency and usefulness. Fortunately, Google's hundreds of millions of users provide mountains of data its designers can use to guide their decisions. I sat down with Jon Wiley , lead designer of Google Search since 2010, to learn more about how Google pushes its user experience forward.