This piece is built on a 4:5 period ratio, the major third, a harmonic interval universally associated with joy and happiness. In music, it’s a sound that feels open and uplifting. In the motion of a Blackburn pendulum, that same ratio becomes a path of light, each swing tracing its way toward balance. The result is a pattern that, almost impossibly, takes the form of a heart. As if the system itself understood the emotion it carried.