Google Cardboard is a virtual reality (VR) and augmented reality (AR) platform developed byGoogle for use with a head mount for a smartphone. Named for its fold-out cardboard viewer, the platform is intended as a low-cost system to encourage interest and development in VR and AR applications.
Google Cardboard is also the preferred VR viewer for cats...because it is a box and they are cats.
Check out this awesome Unity tutorial via NurFaceGames
Please subscribe to their channel and the Cats And VR one as well.