You detect changes in elevation. When in the car or in your bike seat on Mom's handlebars, you say, "Wheee!" when going downhill. When walking around, you shuffle right over flat ground, but if there's a short mound of mulch in a garden, or a short incline of stones, you walk up the incline, think for a moment, and then go down the incline. "Wheee!" And then you go up the incline again, and down again. There are stairs over there. That will be another fifteen minutes.
"Do you want Dad to carry you?"
"No."
"No?"
You sign the word for "down," and you grab your Dad's finger as you stare straight ahead and head down the steps. At the bottom, you let go of his finger, clap your hands and say, "Yay!" You turn around, face the stairs, and head back up.
