  We introduce a new equation we dubbed the modular Dirac equation to see and
reconstruct a spin 1/2 particle at the center of a nearly $AdS_2$ spacetime in
the entanglement wedge reconstruction paradigm and we study hidden symmetries
of this spacetime, too. Various properties of the Dirac modular operator are
studied: a generalized Tomita-Takesaki construction, the connection to the
Schwarzian derivative of the logarithm of the modular Dirac operator, the link
with the an allowable complex metric, the connection to regenesis, we write the
corresponding Lagrangian of the modular Dirac equation and we put in
perspective some limitations of the current bulk reconstruction in the case of
unknown couplings.
