Modules Solid, Solid_XML, Solid_tests and Solid_XML_tests are available at www.numeric-quest.com/haskell/solid/ Some blurb follows. Enjoy. Jan ... What we need from a solid modeler is its ability to help us with mundane computations of certain physical properties of solids, such as areas, volumes, masses, centers or gravity, moments of inertia, etc., and -- on the other hand -- help up visualize those computations somehow. ... This module does not concern itself with final graphical representation or animation of solids. However, it can be readily adapted to one of several existing graphic packages for Haskell, such as graphics from "Haskell School of Expression" or our module GD, which creates graphic files in PNG and JPEG formats. In fact, the latter was used to make the pictures found in attached Solid_tests module. Acompanying this module is module Solid_XML, which supplies a support for reading and writing solid objects in XML format. ...