The sky is the limit.

NO WAIT DONT OH SHIIII...

I just had an interesting thought. What would this concept be like in true 3D? Think about playing it with Oculus Rift. It would have to adjust the size and distance of the objects in real-time as you moved them, which would probably look really funky.

Reminds me a lot of Antechamber.
I don't think Valve will be picking these guys up however.

This is absolutely, and quite litterally, nightmarish.

Put this mechanism in an old mansion with lovecraftian themes and you get me running away screaming.

I swear I've seen this mechanic before. Like for a game jam or something. Anyone remember something like this?

I'm quite sure I've never seen anything like this before, but I don't keep up with the various game jams, so you may be right.

Interesting and original concept, but I can't relate this to Portal 3. After all, the Portal games are about portals to travel between not connected points, and this is a totally different idea using optical illusions to get to the exit of every room, a more closer approach to the main goal of the first (and short) Portal than the full (and long) campaign of the sequel.

Perspective? http://games.digipen.edu/downloads/perspective_setup?id=1170&proj=25930#.Us-0cZ7lZ8E
Scale? http://www.kickstarter.com/projects/1188957169/scale

Yes, but Portal 2 introduced the game mechanics from Tag: The Power of Paint (another student project) in addition to the portal mechanic from the first game. Portal 3 could introduce this perspective scaling mechanic in addition to that.

Fez on steroids?

Looks more like Garry's Mod.

I found it. It's called Tale of Scale: http://ratking.de/projects/game-jams/

But the main theme of the Portal games is science and science fiction, using laws of physics in this fictional future in everything to make it like a real possibility, for example, like the super lubricant to go faster or the super "jelly" to jump higher. But this aspect is totally different in this demo: they move objects using the optical illusion from the point of view to change the size of the objects... that's impossible and looks fake. As a puzzle concept for a game is okay and could be fun, but that's what I can't relate to a Portal game. It's like comparing and mixing "Doctor Who" with "Star Trek".

The blue jumping jelly definitely does not conform to the laws of physics. Nor does the lubricant for that matter, since if it did, it would completely eliminate any traction you might have on the surface, making you unable to run at all.

No, the Portal games are definitely more in the realm of science fantasy than science fiction. The scaling mechanic added as a new function of the portal gun would be just as believable as anything else in Portal 2 (i.e. not very), but would still make for a fun game.

What the...? oO

This game, set in a world similar to Alice in Wonderland. Colourful and creepy at once... Just like a painting of an artist on hallucinogenic drugs. This would be a piece of nightmare inducing beauty.