Ponder the pendulous Pendulum. Slow, graceful, a beautiful demonstration of physics. It swings back, forth, and side to side, an intoxicating motion, tracking little lines in the white sand beneath as it goes. Follow the path it takes by studying the unique designs left behind. Kinetic Motion Pendulum toys are a must have item for your desk. The classic Sand Pit and Pendulum line will be sure to impress anyone who visits your office. These are among the nicest office toys you can give as a gift. These kinetic motion pendulum toys will add some style and class to your workspace. The pendulum was the world's most accurate timekeeping technology until the 1930s! They're still used to regulate pendulum clocks, and in scientific instruments like accelerometers and seismometers. The pendulum's resting position is called the equilibrium position. When something moves it from that position, gravity tries to force it back. Gravity combined with the mass of the pendulum causes it to oscillate around the equilibrium position, swinging back and forth. The time it takes for the pendulum to perform one left swing and one right swing is called a period. The period depends on the length of the pendulum's rod and a little bit on the width of its swing, also known as amplitude. For small swings, the period of the pendulum is the same regardless of the size of the swing. Even if amplitude changes, the swings of the pendulum take the same amount of time. Which is what makes the pendulum such a useful timekeeper! Galileo Galilei discovered this in 1581. While sitting in church studying the chandelier overhead, he counted his heartbeats and found that the time it took the chandelier to swing back and forth was the same, no matter how wide or narrow the pendulum's swings were. Galileo first used freeswinging pendulums in simple timing applications. Experiment for yourself with a desktop pendulum by giving it a hard or soft push, and counting how long it takes the pendulum to complete one cycle!