[beagle3]

It's just a 3-d subspace of the continuous (infinite dimensional) input space. If you start in the em frequency domain (which is the only sensible thing to do) nothing is cyclic, so it is not customary to call them Fourier coefficients - but I think you got the concept.

[agumonkey]

A tiny bit. From the point of view of my ignorance I'm still thinking you might troll me :)