Considering four-dimensional space-time geometries within real projective geometry provides a mathematically well-defined framework to discuss their deformations and limits. I explore axiomatically introduced projective quantum fields, based on generalized unitary transformation behavior. A range of structural properties leads to similarities with the Standard Model of particle physics. Fermionic and bosonic superselection sectors can be generalized to this setting, and the irreducibility of projective quantum fields singles out Dirac fermions. Considering projective reference frames, gauge bosons appear and interact with other projective quantum fields similar to one generation of the Standard Model.