Clustering helps to get an overview of different concepts associated with a query. Even with very vague keywords particular images can be found very quickly by focusing on similar clusters or images.
The use of the palm image search engine is very simple:
palm is a student project from HTW Berlin (University of Applied Science). palm was developed by Frederic Cabassut, Janina Trost, Jonas Hartweg, Judith Junge, Ruzbeh Resaei and Stephanie Grieger under the supervision of Prof. Dr. Kai Uwe Barthel. palm uses visual search technologies developed by pixolution.