The Games Children Play

In one of my trips to Marawi, I came across this child pulling around a little toy truck.  The thing was moving steadily, its wheels rolling smoothly against the rocky pavement.  From far away I could see that it was gray, strangely shaped, and was tied at the front end with a length of straw.  The little girl ran around, with the pull toy trailing behind.  She finally ran towards me, and I finally saw the truck up close.  It was made from an empty container of what I think was either gasoline or motor oil, with a sturdy wooden stick piercing through from underneath it where the rubber wheels were attached.  When scrutinized, you'd see that the wheels were carved from heels of old rubber slippers.  Ingenious, I thought.