Now this was something I had never seen beforeā€¦ and it seemed especially out of place on a playground. It was a caterpillar. Not a normal caterpillar though; this one was 7 feet tall, about 100 feet long, and it had a skin that was 12 inches thick. Not to mention that it was made out of steel-reinforced concrete. It was just one more thing to add to the list of paradigm-shifting experiences that took place on our trip with the David Project to areas that have been…