  Weak radiative hyperon decays present us with a long-standing puzzle, namely
the question of validity of a hadron-level theorem proved by Hara. We briefly
discuss the conflict between expectations based on Hara's theorem and
experiment as well as the way in which the quark model evades the theorem.
Violation of Hara's theorem in the quark model is traced back to the issue of
hadron compositeness and the nonequivalence of standard ways of imposing
gauge-invariance condition at quark and hadron levels. This suggests that our
understanding of nonlocal composite nature of hadrons may require some
important change.
