3D
3D
[People are lined up to see a movie.] Premiering Tonight: String Theory: An Exposé Presented In 3D!
[The people are in a dark theater, fiddling with their glasses.] ???
[The people angrily approach black hat, who's sitting at a desk.] Megan: Your movie was a ripoff. Cueball: It wasn't 3D at all! Black Hat: Was too. Black Hat: It's just that the third dimension is tightly rolled up and too small to observe at normal energies.

String theory hypothesizes that there are many more than 3 dimensions , it's just that we can't see the rest because they're "rolled up." A common metaphor is an ant on a tightrope — it has two degrees of freedom, one along the rope and one around it, but from far away we can only see one.
So Black Hat released his 2D movie about string theory in "3D", and claimed that the third dimension was there — just too small to see.
The title text refers to a linear particle accelerator , or "LINAC", which is used to create high-energy particles. Incidentally, the glasses give their particles one mega-electronvolt (symbol MeV ) of energy, which is not particularly high for a particle accelerator. The title text suggests that such moviegoers should try the accelerators at the European Organization for Nuclear Research, CERN , since they are widely known for producing the highest energies in the millions of MeV, and thus have the best chance of unraveling the small dimensions of string theory.
On the xk3d prank site created along with 880: Headache , the 3D on this comic is not visible.
[People are lined up to see a movie.] Premiering Tonight: String Theory: An Exposé Presented In 3D!
[The people are in a dark theater, fiddling with their glasses.] ???
[The people angrily approach black hat, who's sitting at a desk.] Megan: Your movie was a ripoff. Cueball: It wasn't 3D at all! Black Hat: Was too. Black Hat: It's just that the third dimension is tightly rolled up and too small to observe at normal energies.
