“It’s not unusual for new technologies to first enter popular consciousness as toys.  In the 1st century, Heron of Alexandria invented the aeolipile: a metal ball with curved nozzles sticking out of it, perched on stilts. With water in it, and flame beneath it, the resultant steam would make it spin, whiz, whiz, whiz. Such fun. Nobody understood they were looking at a steam engine. Hence, the Industrial Revolution didn’t start for another 1700 years.”  [source]