There are moments when a new technology causes a paradigm shift. In each such case, the introduction of one innovation has resulted in many millions of people experiencing reality differently.
Some of my favorite such moments in recent times were the introduction of, respectively, trains, paperback books, cars+roads, indoor plumbing, electricity as a utility, cinema, airplanes, radio, television, air conditioning, the Web and SmartPhones.
Then of course there are all the medical advances which have extended human life dramatically. That constitutes an entire category by itself.
I wonder what the next big paradigm-shifting technology will be.