Google cardboard is a virtual reality headset set. It's not one of the fancy ones but it still works. Click the link below to watch how to make a cardboard virtual reality headset. If you don't like how this is built then look at other ways to make them on YouTube!!! The one under it is 2 more links to see a VR video. There is a regular one and a 360 degree one.
https://www.youtube.com/watch?v=8qNmRi-gNqE
https://www.youtube.com/watch?v=OQL1gochKLk
https://www.youtube.com/watch?v=rrZuH2MtLcs
https://www.youtube.com/watch?v=8qNmRi-gNqE
https://www.youtube.com/watch?v=OQL1gochKLk
https://www.youtube.com/watch?v=rrZuH2MtLcs