What everyone thought was an innocent little experiment from Google during last year's I/O has turned into a full-on Virtual Reality venture from the company. Cardboard, a piece of actual cardboard that you fold and insert your phone in for a make-shift low-cost VR display, has been getting more focus and momentum over the past year with 500 compatible apps and over 1 million viewers sold or given away. That rise culminated with a few announcements at yesterday's I/O keynote.

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