I am a cattle kraal. Kids use me to pretend they are herding cattle through the Great Rift Valley.
People play video games in which they pretend to ski or drive cars.
Lots of games involve pretending to do something that people do in the real world. My cattle herd is made up of stones entering into a cattle pen made of sticks. Since there are lots of sticks and stones around, I am easy to make anywhere. They are the smallest stones in a separate small pen. The stones are all different shapes and colors and can be recognized as individual animals for play purposes just as real animals would be recognized by their owner.