From Robin Hansen's Overcoming Bias blog:
Most people are surprised to hear that the world economy doubles roughly every fifteen years; when they think back fifteen years, the world doesn’t seem that different. Besides a few big changes, most things seem pretty similar. But this is illusory – most change happens behind the scenes. In fact, one of the reasons why change can be so fast is that most of it happens behind the scenes. If ordinary people had to notice and deal with more changes, we just couldn’t change this much.
Photo by Flickr user annais, used under a Creative Commons license.