The point combines perpendicular oscillations with a frequency ratio. After three horizontal cycles and two vertical cycles, both phases return together, closing the curve.光点合成了频率比为 的两个垂直振动。横向完成三个周期、纵向完成两个周期后，两者同时回到原相位，轨迹因此闭合。
The horizontal coordinate follows ; the vertical coordinate follows . The bright trail shows recent positions along the same fixed curve.横坐标按 变化，纵坐标按 变化。亮色尾迹标出最近经过的位置，整条曲线本身保持不变。