My kiddos have a 'rock' collection outside our front door. Every time we step outside, the kids step into their rock-seeking mode, always bringing back treasures and adding them to their collection. The other day, Gillian brought some of her new treasures into the car with her, and Josh was insisting (rather desperately and repeatedly) that she let him hold one. Gillian, not wanting to share, said "Josh, there is more to life than rocks. There are pebbles and stones too."