Technology has now enabled a completely new way of exploring the third dimension, albeit vicariously. The result is the tidal wave of drone flying that is washing over us. It is destined to take both the good sides and bad sides of our exploitation of the third dimension to whole new levels. After more than 100 years of flying, we have only about 200,000 aircraft on the FAA registry, whereas in about six months, there were 500,000 registrations for drones. And most drone owners we know say they have no plans to register theirs. The FAA forecasts that 4.8 million drones will be sold in the United States in 2017, and 7 million per year by 2020.