"For whatever reason, this has just been a rolling ball."
An optical mouse uses a tiny digital camera instead of a rolling ball to track movement.
He taught that the world is a rolling ball.
His yellow hair lifted and his eyes were intent on the rolling ball.
There were toys on the floor: a rolling yellow ball, a doll, a plastic rattle.
What could stop the rolling ball is a downturn in the market.
"Let's get away from the house," I said, reaching down for the rolling ball.
They landed back in the hall, a rolling ball of fur, claws and teeth.
As the center fielder pursued the rolling ball, he took off for second base.
This isn't ideal: there's a risk that he'll be turned onto his back by the rolling ball, and he could become stuck upside down.
