A geometric circle in R^3 is the set of points in a fixed plane that lie a fixed positive distance from a center point that lies in the same plane. (Notice that "circle" refers to the curve, and not to the disk it bounds.) In my posting and followup "Circle Puzzle," (geometry.college, geometry.puzzles, November 28, 1994), I explained a way to fill all of R^3 with disjoint geometric circles. It is discontinuous; i.e. the map from each point on by a particular circle to the triple (center, normal, radius) is not a continuous map. It is not hard to show, using algebraic topology, that it is impossible to fill all of R^3 continuously with disjoint geometric circles.