  Inspired by the flow description of su(N) colour calculations, we recently
showed how to simplify the spinor-helicity formalism (at the algebra level two
copies of complexified su(2)) by treating each Weyl spinor as part of a flow
line with definite chirality and momentum. This formalism, dubbed the
chirality-flow formalism, eliminates all non-trivial algebra from tree-level
spinor-helicity calculations, thus allowing the shortest possible route from
Feynman diagrams to complex numbers (spinor inner products). In this
presentation, we briefly introduce the main features of this method and show
some examples.
