With the smartphone and the construction of cardboard, you can build a simple viewer for virtual reality (VR).
https://www.google.com/get/cardboard/
Now you can display educational 3D video (side-by-side) , for example …
[youtube https://www.youtube.com/watch?v=rI1ixuYEgM4]
https://www.youtube.com/watch?v=rI1ixuYEgM4
… or you can use mobile apps for example …
http://www.vrizzmo.com/aplikacje