Nathan is obsessed with wheels!
He points them out wherever he sees them, which is everywhere: cars, trucks, airplanes, the subway, buses, shopping carts, his stroller, his toys, the sliding shower doors in our bathroom, kitchen and desk drawers, the track of our vertical window blinds, even the scotch tape dispenser. And if some other object moves or has moving parts, but he can't see any wheels, he predicts that it might have wheels anyway, like the elevator in our building, the washing machine, some construction cranes we can see from our balcony, the toilet, cabinets, gates, and so on. In fact, throughout the course of a typical day, Nathan probably says "WHEE-TEE!" more than any other word.
When I came home from work this afternoon, Nathan was still taking his nap. Within 30 minutes of my arrival, I heard him talking in his room, so I went to check on him. I slowly opened the door and peeked in. He was wide awake, lying in his stroller (where he usually naps), pretending to drive -- doing the hand motions of turning a steering wheel -- and repeating softly to himself, "Wheetee, wheetee, cah (car) wheetee, tucka (truck) wheetee, toh (stroller) wheetee, tee whee (steering wheel)..."