  The physics of classical particles in a Lorentz-breaking spacetime has
numerous features resembling the properties of Finsler geometry. In particular,
the Lagrange function plays a role similar to that of a Finsler structure
function. A summary is presented of recent results, including new calculable
Finsler structures based on Lagrange functions appearing in the
Lorentz-violation framework known as the Standard-Model Extension.
