This tank in a park near Collingwood Ontario got me thinking about the fact that dry stone walls are often sited as being unsafe structures for children to play on in public places. People have said to me when I have been commissioned to build one somewhere - "But what if a child falls from that?" I usually say something polite about how safe dry stone structures are. The fact is that kids like to climb but they are usually pretty careful. My secret answer to these sort of questionings about children being protected from climbable structures is - "Well, what was God thinking when he made trees?" Or in this case- " What are town park planners thinking when they drive a tank into the park for kids to play on?"