Roger Bailey: Why not put the vertical stick in the hole through the horizontal disk, using the colors from the disk to surround the reflected shadow of the stick with pretty colored light? You could then make a vertical cylindrical white wall to catch the shadows and colors, for a reasonably scaled design of grace and beauty. The markings could be printed out on a sheet of paper and the latter glued to the circular cylinder. Of course such a sundial would be somewhat transient, as sundials go, but could be a fun project for students. The portion of a cylinder used, a kind of circular arc, would match the circular curved nature of the CD aesthetically. The cylinder could be a few inches to a few feet (or a few centimeters to a few meters) in size, depending on your wishes and what works best. Let us know if you try this.
Ross McCluney, Cocoa, Fl, USA
