A couple of weeks ago I picked these up and they have been sitting on my desk, gradually drying out and losing their glorious gloss.
Today I made the connection with this, which is also sitting on my desk, maybe sold as an 'executive toy', but also called Newton's cradle. You may be familiar with it, if not watch what it does. It was always a fascination to someone in a physics class.
But what about this - a newer physics toy and don't blink when you press play or you will miss it.
Superficially it is similar to the above both have ball bearings, and you might expect it to behave in a similar way, but in fact it behaves very differently.
Come back tomorrow for more on this.