Today we were about three quarters through a rather fine game of Moomin dominos (a brilliant gift that Mikey brought back from Finland - home of all things Moomin. It's a pity that Nathaniel has no idea what a Moomin is!), when Nathaniel suddenly had a moment of clarity.
"It's just like a road!" he exclaimed. "Drive cars on the road"
And that was the end of dominos for the day.