A year and a half ago we introduced Google Cardboard, a simple cardboard viewer that anyone can use to experience mobile virtual reality (VR). With just Cardboard and the smartphone in your pocket, you can travel to faraway places and visit imagined worlds. Since then everyone from droid lovers and Sunday edition subscribers, to big kids and grandmas have been able to enjoy VR—often for the very first time. Here's a look at where we are, 19 months in:

1. 5 million Cardboard fans have joined the fold.