We present the DataMeadow, a visual canvas providing rich interaction for constructing visual queries using graphical set representations called DataRoses. A...
http://www.cse.chalmers.se/~tsigas/papers/DataMeadow-InfoVis.pdf
J. Fekete, A. Kerren, C. North, and J. Stasko (Eds.) volume 07221 of Dagstuhl Seminar Proceedings, Internationales Begegnungs- und Forschungszentrum fuer Informatik (IBFI), Schloss Dagstuhl, Germany, (2007)