  Inspired by recent results of unusual properties of loop processes in
relative locality, we introduce a way to classify loops in the case of
kappa-Poincare momentum space. We show that the notion of orientability is
deeply connected to a few essential properties of loop processes. Nonorientable
loops have "effective curvature", which explicitly breaks translation symmetry,
and can lead to a breaking of causality and global momentum conservation.
Orientable loops, on the other hand, are "flat." Causality and global momentum
conservation are all well preserved in this kind of loops. We comment that the
nontrivial classical loops in relative locality might be understood as dual
effects from general relativity, and some physical implications are discussed.
