Pack of 2 Spirograph Geometric Ruler and Drawing Toy - Great for Increasing Your Creativity Dual purpose product , Spirograph Geometric Ruler and Drawing Toy Perfect choice for children Brain development. Can be used as Ruler also. Perfect gift to children Place the ruler on a sheet of plain paper. Place the small circle provided inside the ring. The point of a pen is placed in one of the holes of the circle. As the circle is moved, the pen traces out a curve. Usage: 1. Place the ruler on a sheet of plain paper. Place the small circle provided inside the ring. Usage: 1. Place the ruler on a sheet of plain paper. Place the small circle provided inside the ring., 2. The point of a pen is placed in one of the holes of the circle., 3. As the circle is moved, the pen traces out a curve., 4. Pens of various colors can be used, to add texture and color to the design by switching colors in a set pattern or a random fashion, as seen in the image above.