The document discusses some observations from hacking cities. It makes three key points: 1) Local culture and initial conditions can have unexpected impacts due to the butterfly effect and law of unintended consequences. This leads to complexity in decisions. 2) New technologies like Uber and Airbnb have temporarily ignored regulations, but a long-term solution will require engagement with political and regulatory systems. 3) There are opportunities to hack physical infrastructure like parking and roads through new platforms and APIs, but basic infrastructure needs like power, water and sewage need to be addressed first before DIY solutions.