Indie developer Arthur Lee has created something that looks a lot like a blueprint for Portal 3.
Try to imagine a version of Portal that lets you move around and manipulate fixed points in spacetime and you're close to describing this as yet unnamed "screenshot" tech demo. Uploaded to YouTube by indie games developer Arthur "Mr. Podunkian" Lee, this short video shows him having fun messing around with the spacetime continuum and some boxes.
Lee has used Unity 3D to combine best parts of Portal and Snapshot, resulting in a slightly mindbending experience where he takes a snapshot of an event which turns into a portal once attached to a flat surface. New dimensions are created and past events return to the future with physical force.
Everything about this looks great, though I can't help but wonder what would happen if you took a snapshot of a snapshot. Would you be able to jump back through it and into the dimension captured by the snapshot within it? Lee says on his blog that he's planning to update everyone on the future of "screenshot" soon; given how well his concept works, we won't be the only ones paying close attention.