When my daughter was 3 years old, I bought her this amazing toy called Magnetix, which is basically nothing more than a few large metal marbles and some multicolored plastic rods with magnets at each end. It’s a great toy, letting you build all sorts of nifty geometric shapes, and she really loved it. It’s invaluable as a child-distractor, though she’s already starting to outgrow it.
This takes the idea to the next level – and is definitely not for kids, nor something you will ever outgrow:
That’s brilliant. Forget the rods, just use the balls, and make those magnetic. Is it just me or should this thing be part of every graduate physics curriculum?