“…There have been numerous attempts at classifying images [Blackwell andEngelhardt 1999, Duke et al 2004], based on data types and tasks [Wehrend and Lewis 1990, Yu and Behrens 1995, Shneiderman 1996, Zhou and Feiner 1998, Wenzel et al 2003, Tory and T. 2004, visualization algorithms and models [Tory andT. 2004, Chi 2000], visual elements [Bertin 1983], mappings between data and visual elements [Mackinlay 1986, Rogowitz and Treinish 1993, Zhang 1996, Zhou et al 2002b, Zhou et al 2002a, as well as subject sorting of conventional methods of presentation [Lohse et al 1990].…”