Thanks to smartphones, photos are the new language of the Web. Each day people upload 1.8 billion new images to the Internet. The only problem with all that pic-sharing? The Web’s entire infrastructure is built around text. (Even Google’s image search function relies on text to identify images.) So how do we search, sort, browse, and navigate a rapidly growing sea of images? We teach our computers to actually see them. As you can imagine, that’s no small challenge.