To: The Igor Pro Community This experiment is offered as an example of the capabilities of Igor Pro, in particular a technique for the creation of a number of rotating slices through a collection of sparsely scattered data points. The slices are used for data visualization in the form of a QuickTime movie (made by and viewed within Igor Pro), or as PICTs (viewed and/or animated with N.I.H. Image, for example). The slicing technique described here will probably work best for "volumetric data"; i.e., a cluster or "bee-swarm" of points in some 3-D space, possibly with an internal structure or outer boundary that can be further visualized with color information. It is probably least useful for viewing a continuous function such as a 3-D spiral. The examples contained herein, from the field of colorimetry, are introductory in nature and no guarantee is extended for their usefulness or applicability in serious colorimetric analysis. Mike Young 3/19/94 young@gaia.polaroid.com