VaeVictis:i find it funny that you even consider grammar a sign of intelligence, that itself is a very uneducated claim
You're thinking too much into it. The screen is flat, hence 2D. So is the paper your graph is on. The "illusion" is how we perceive what is on the paper/screen, making it 3D in our minds.Hope that helps.
Technically speaking, Quake 2 is 2D. The screen creates the illusion of 3D.