After successfully running from the police, you return home and go to your terminal.  You quickly find your orange friend Jon who is supposed to be in prison and a bright, large white object that strangely gets brighter and dimmer as you look at it.  You then return to your terminal screen.

05-03-3458

Player:  Jon!  How did you get here?

Jon:  Ah, well that's easy.  My friend Al simply picked me up and put me here.

Player:  But I locked the door.  You'd have to have teleported to get in here, and that's impossible.

Jon:  Maybe not possible in 3 dimensions...

Player:  Hey, you should be careful talking about that stuff.  It got you in enough trouble the first time.

Jon:  Look, you want to know what's going on here, or don't you?

Player:  Okay.  I'll let you say your crazy theories.

Jon (sarcastically):  Thank you so much.
Al exists here within the 4th dimension.  He can see what we look like, but we can't really see what he looks like.

Player:  Are all 4-d things that big?

Jon:  He's not bigger.  Just brighter.

Player:  Look, just because I don't subscribe to you 4-dimensional heresy doesn't make me stupid.

Jon:  No, no.  Not brighter, brighter!  More light.

Player:  I seem him right in front of me.  Or part of him.  He's very large.

 Jon:  Quick physics lesson, Sparky.  You know the constant illumination law, don't you?

Player:  Of course I know it.  It's obvious.

Jon:  Refresh my memory.

Player:  Here, I'll draw a picture or two:
Here's two objects.  They both give off the same amount of light. Every object gives off the same amount of light.  That's the law of physics.
But in this case, object A is much bigger.  It takes up a greater arc of my vision, so more of its light hits my eye than object B.  So it looks bigger, which it is.

Player:  Here's another way something can give off more light.  Here object A is much closer to me than object B.  So more of its light hits my eye because it takes up a bigger arc of my vision.  Simple enough.

So Al here is either bigger or closer than his surroundings, because he's giving off much more light.

Jon:  Good.  Now let me give you another picture.

Imagine that there might be objects that didn't obey that law. Objects that put out more light.  Objects that are brighter.

Player:  Objects that don't obey the laws of physics?

Jon:  Well, I entered a locked room without opening the door.  That doesn't obey the laws of physics either.  Anyway, if object A puts out more light than object B, then more light will hit your eye from A than B, even though they're the same size and the same distance away.  But you're used to objects always putting out the same amount of light, so A would look bigger or closer to your untrained eye.

Just so with Al here.  If you'd just put your hands up in front of your head, you'd see he's not growing and shrinking.  He always takes up the same angle in your vision.  He just looks bigger because you assume brightness and size are the same thing, which is true for everything from our world, but not for him.

Player:  So why does he not obey the laws of physics?

Al:  That's because the laws of physics aren't really what you think they are.  You know that air pressure decreases when you get high up in the atmosphere, right?

Imagine some Flatlanders (you've read Flatland, right?) living in a planar surface parallel to the ground.  They might have a law of physics saying air pressure is constant.  But it's not constant. Their world just happens to include the set of points where the air pressure is always the same.

Same with your world.  Your world is a 3-space that intersects the real 4-dimensional universe in such a way that everything happens to have the same brightness.  But if you were to move perpendicular to your world, you'd find things that were brighter and dimmer.  And since parts of me are perpendicular to your world, parts of me are brighter and dimmer.

Player:  Perpendicular to my world?  What does that mean?

Jon:  How many basic directions are there?  There's north, there's west, and there's up.  That's three dimensions.  But there's a fourth direction that we can't experience because we're only three-dimensional creatures.  We don't have a word for it, but it happens to be the case that things put out more and more light as you go further in that direction.  So Al calls it "Bright".

Player:  I'm not sure I understand.

Jon:  It's not easy, man.  Give it time.  But the key thing is, the blues don't want the lower classes knowing about this stuff.  I guess they figure they'll lose their power if someone else makes a discovery this big.

Player:  Speaking of the blues, what happened to the prison guards? Why did they leave?

Al:  Ah, well, after I found you here safe, I went back to rescue Jon, which was in fact quite easy.

Player:  Easy?  I almost got killed.

Al:  Easy for a four-dimensional creature.  Imagine you're rescuing A-square from his imprisonment in Flatland.  No matter how many dangerous triangles were guarding him, rescue would be easy.  You'd just pick him up out of Flatland and return him home safe.  Which is exactly what I did with Jon.

Jon:  The blues are probably back at the prison, looking for me. They'll have to come back this way eventually, and I wouldn't want to stick around then.

Player:  But how did they learn about this four-dimensional stuff in the first place?

Al:  Well, that's not something they teach you in history classes here.  The Blues haven't always been in power.  All that stuff about being closer to blue being better, that's just something they made up.  There's a four-dimensional guy at the heart of it.  In your language his name sounds something like "Nodrog".  He taught the blues about the Fourth Dimension, and that's how come they're so effective here.  Meanwhile they support him so he can concentrate on four-dimensional matters.

All that gunk about the Blue Revolution and the rightful rulers taking over is a cover for the real story.

Jon:  Look, it's lovely to chat, but we have to get out of here before the blues find out where we're hiding.  Al will be fine, but I'm a little easier for them to catch, and so are you.

Al:  I'll drop a four-dimesnional ramp into the coat-room here.  Just walk into the brightly-lit passageway to your right and we'll get out of here.

Player:  Hold on a second.  I'm not sure I believe all this stuff you've just told me.  What's to stop me from going to the phone in the kitchen and telling the blues about you myself.

Jon:  Nothing.  If you want to turn in your old friend, you're welcome to try.  If you think they'd actually be able to catch me.

Now you must choose what you will do.  Should you call the police or try the fourth dimensional ramp?