  The notion of position operator for massless spinning particles is discussed
in some detail. The noncommutativity of coordinates is related to the gauge
symmetry following from the freedom in definition of standard state in Wigner's
construction of induced representations of Poincare group. The counterpart of
Newton-Wigner operator is discussed. It is explained why the Newton-Wigner
construction works only for helicity $ \mid\lambda\mid\leq1/2$.
