Enter a search term, and click Search Images. (Because this is still a trial, some keywords are not searchable. Be patient). I searched for images of the word "color".
Once you find the group of images you're interested in, you can click on the thumbnail and a cluster of images will "swirl" into view. For example, here's what you'll see if you click the image in the top row, second from the right.
Image Swirl, and try it out. It gives you a new way to relate images, and refine search terms.