  The nature of hadrons is one of the most fundamental mysteries of physics. It
is generally agreed that they are made of "colored" quarks, which move nearly
free at short scales but are confined inside hadrons by strong interactions at
large distances. Because of confinement, quarks are never directly observable
and, experimentally, their properties can be tested only indirectly, via high
energy collisions. Here we show that superinsulating films realize a complete,
one-color model system of hadron physics with Cooper pairs playing the role of
quarks. We report measurements on highly controlled NbTiN films that provide a
window into the interior of "Cooper pair mesons" and present the first direct
evidence of asymptotic freedom, `t Hooft's dual superconductivity confinement
mechanism, and magnetic monopoles.
