Google’s experiment into a cheaper version of virtual reality isn’t just an experiment anymore, as Google takes “Cardboard” more places, showing you how to make it yourself and getting more app developers involved.

It seems this whole virtual reality thing isn’t going away, and while it appeared in the 90s way ahead of its time, the idea is coming back. It’s returning with the Oculus headset that has revitalised interest in the concept, with Sony joining with its own Project Morpheus later on, as well as Samsung’s interest in the technology linking it to its Galaxy Note 4 smartphone.

But while all of these will probably cost two or three hundred dollars (at a minimum), Google is also interested, and has been eyeing the space with an option of their own.

A budget option at that.

Unveiled this year, that option is called “Cardboard,” and for those who haven’t heard what it is, it was Google’s attempt at making an inexpensive virtual reality option that turned your phone into the entertainment device and a bit of cardboard and plastic lenses as the headset.

To give you an idea of how inexpensive it is, you can assemble it yourself if you have some magnetic, lenses, cardboard, velcro, tape, and a rubber band, and provided you have a smartphone which acts as the viewer.

Smartphones that can make this work generally need at least a Full HD display and have to have a screen size between 4.7 and 5.5 inches, but the better the resolution, the better it is, with the 2560×1440 displays working well in this regard and splitting the screen in half, essentially providing a 720p picture per eye.