Think of Google Cardboard as the poor man's Oculus Rift. It's a virtual reality interface made of cardboard and plastic lenses. Slip an iPhone with a compatible VR app inside and you can experience a seemingly 3-dimensional world that moves in any direction you turn.
Recently, Caleb Kraft of Make magazine was in staff meeting during which one person mentioned the need to build an editable VR interface. Another person misheard, thinking that he had said edible.
Thus was born this brilliant project. Kraft used graham crackers to assemble that a Google Cardboard-compatible VR viewer that is entirely functional and edible--except for the lenses, of course.