Google keeps experimenting new innovations in its search technology and may be their evolving algorithm is what makes them a search giant. Their latest innovation comes to image search with an experimental feature in Google Labs named as Image Swirl.
Google Image Swirl cluster similar images into representative groups in a fun, exploratory interface. When user make an image query the new feature displays 12 image thumbnails relevantly related to the query made. Each thumbnail is a group of images. On choosing a group among those thumbnails displays a circular rotational cluster with similar queries branch off.
User can then further explore additional sub-groups within any cluster.
Google Image Swirl is built on new computer vision research to cluster similar images into representative set. Image Swirl is advancement 
made to combined technologies of Similar Images and Picasa Face Recognition. It shares its basic from these technologies to form sets of similar images and to build hierarchies out of these groups.
Pointing over the pictures with cursor shows the pics dimensions and the link to the domain where image originally belongs.
Google explains the cover photo representing the group is “an algorithmically-determined representative group of images with similar appearance and meaning”. The Image Swirl has similar interface as that of Google Wonder Wheel used for text search.
Like the Bing’s Visual search launched in mid September Google Image Swirl is also available only for 200,000 queries at present. Google Product Manager Aparna Chennapragada said in the blog post that available queries will auto-complete as user start to type in the search box, similar to Google Suggest.