\textbf{Left:} Schematic diagram of the magnetic pendulum\newline\textbf{Right:} Projecting the position of the bob (white square at position $\bm{x}$) onto the horizontal $(x,y)$ plane. The base-plane magnets (red squares 1, 2, and 3) are positioned at the vertices of an equilateral triangle.

Matthew is a postdoctoral researcher at the University of Cambridge. He hasn’t had time to play Klax since the noughties, but he’s pretty sure that Coke is it!

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