The TeacherGeek Flag Waver Activity is an excellent introduction to TeacherGeek construction techniques and components. By combining gears, pulleys and cams you change rotary motion into linear motion to raise, lower and wave flags by simply turning a crank. Once you have experienced the TeacherGeek building system, you can create anything with TeacherGeek components. You will find the Flag Waver Construction Guide (a free downloadable document) is easy to follow, fun and informative.