Google Cardboard is a new device from the massive company that is extremely economical and surprisingly simplistic coming from such a complex brand. The design is made from cardboard, and is a headset that attaches to one's smartphone.
Although people can buy the device for a low cost, they can also simply make this themselves. After eating a pizza on a Friday or Saturday, one can take the cardboard, download the files from the site and try their hand at putting together this DIY virtual reality headset. However, I would not recommend putting the device on while walking around outside. For one, you could run into numerous objects, and two, it does look a bit out of place.
Photo Credits: designboom, developers.google