Watching little boys grow in their play is wonderful. Using cars as an example.. When they start they suck on them, they have to feel them in their mouths.. then start 'rr-ing' the motor as they pretend play. Then they'll start to line them up in parking lots, but noone would be able to get out of the cars because they are literally side by side.. Then they take them outside and create roads in the driveway or dirt and then the cars each get their own parking spaces and the passengers can actually get out of the car..
These are J's favorite CARS. He has a collection of the Disney CARS. These 3 though are what he enjoys playing with..