  Evidence for an explicitly exotic state with isospin 2 and spin-parity 2^+
near the $\rho\rho$ threshold and nontrivial complementary indications of the
unusual quark composition of the $f_0(980)$ and $a_0(980)$ states obtained from
the reactions of two-photon formation of neutral meson resonances are
discussed, together with puzzling phenomena in the channels
$\gamma\gamma\to\rho^0\phi$ and $\gamma\gamma\to\rho^0\rho^0$ at high energies.
