  Given a consistent choice of conformally invariant boundary conditions in a
two dimensional conformal field theory, one can construct new consistent
boundary conditions by deforming with a relevant boundary operator and flowing
to the infrared, or by a marginal deformation. Open string field theory
provides a very universal tool to discover and study such new boundary
theories. Surprisingly, it also allows one to go in the reverse direction and
to uncover solutions with higher boundary entropy. We will illustrate our
results on the well studied example of Ising model.
