Earlier today, Kara went to the park and brought her walker wagon with her. She told us she'd fill it with "treasures." Usually, she'd pick up twigs, leaves of different colors, or flowers that fall from trees.
I usually just observe what she does. At one point, she couldn't push the walker wagon forward. She did not ask for my help, and I knew she wouldn't. She started going around, checking each corner carefully. Then 2.8 year old Kara told me: "Mama, there's a big rock in front of my wagon" (it was about the size of my fist).