The aim of exploratory projection pursuit (EPP) is to find linear combinations of variables so that data exhibit clusters with respect to those variables. EPP is similar in in some ways to principal components analysis.
The software associated with Friedman, J.H. (1987) Exploratory projection pursuit. Journal of the American Statistical Association, 82, 249--266 is also available from the StatLib archive.
Chris Jones has kindly agreed to allow us to distribute his two-dimensional pp subroutines written in FORTRAN. He has written a report describing the software. Further details can be found in Jones, M.C. and Sibson, R. (1987). What is projection pursuit? (with discussion). Journal of the Royal Statistical Society, 150, 1--36.
This work was about projecting multi-spectral images into colour images like the three-colour composite of Chew Valley Lake in Somerset.
There is some free software for S that can perform three-dimensional EPP.