  Through AGT conjecture, we show how triality observed in \N=2 SU(2) N_f=4 QCD
can be interpreted geometrically as the interplay among six of Kummer's
twenty-four solutions belonging to one fixed Riemann scheme in the context of
hypergeometric differential equations. We also stress that our presentation is
different from the usual crossing symmetry of Liouville conformal blocks, which
is described by the connection coefficient in the case of hypergeometric
functions. Besides, upon solving hypergeometric differential equations at the
zeroth order by means of the WKB method, a curve (thrice-punctured Riemann
sphere) emerges. The permutation between these six Kummer's solutions then
boils down to the outer automorphism of the associated curve.
