Check it out! Wearing the Rift allows one eye to see the image on the left, while the other eye sees the image on the right. As it turns out, the 3D effect of the Rift is not actually magic, but science!
If you look closely, you can see that the left-hand image is framed slightly to the right, and vice versa. Our brains—fantastic computers that they are—note the disparities between the images in each eye, calculate the angles and dimensions, and merge them into a single image with perceptible depth.
Prest-o blam-o! 3D rockets flying past our n00b heads.