Neptune and Pluto are stuck in a loop! Pluto takes 1.5 times as long as Neptune to orbit the Sun. This means that Pluto completes 2 orbits while Neptune completes 3 and then the cycle repeats.

Run the code at different speeds and change the position of the string to hear this rhythm.

This pattern can also be associated with the notes C and G. The jump between these notes is called a 'perfect 5th' which is also heard in the first two notes of 'Twinkle, twinkle, little star'.