Cell phone technology, guide dog training and finding somewhere to live are just a few of the everyday examples used to help students understand and visualize a locus as a set of points that obey a given set of rules. In Loci, basic construction techniques are explored alongside these real-life examples, along with the intriguing concept of regions. Students also get a feel for how compasses can be used to draw these accurately in this entertaining program that sheds light on loci through dynamic visual images and demonstrations. A Teacher's Guide is included. .