Global clipa on Instagram: "This X post shares a video of 15 pendulums with equal-length strings released at staggered intervals, creating an optical illusion where individual balls swing linearly but collectively form rotating wave patterns, garnering over 5,000 likes for its mesmerizing physics demo.�� The phenomenon, known as a pendulum wave, demonstrates harmonic motion principles: each pendulum oscillates independently in a straight line at the same frequency, but phase differences produce