We're Still Far Away From a True Image Search

Years ago I'd mentioned to a friend how someone should create an image search based on images and not on phrases.  So I could put in a picture of a Ding Tripod and get all sorts of images that somehow shared visual similarities with Ding Tripods across the world (Even if the image name was J00001.jpg or someweirdmayanthing.png).  Just played around with Google's Similar Images search, expecting that the folks who just handed 30 million books to Stanford had finally gotten it.  They haven't.  ...