As used to trim a corner where a wall and a ceiling meet, a crown molding
member has a planar portion, an intermediate portion, and a mounting
flange. The planar portion is attached to the ceiling, in a first mode,
or to the wall, in a second mode. The intermediate portion may have a
coved, stepped, or curved profile. The mounting flange is attached to the
wall, in the first mode, or to the wall, in the second mode. When applied
to the mounting flange, drywall-finishing material, so-called "mud" in
trade parlance, is pressed through apertures in the mounting flange,
against the wall, in the first mode, or against the ceiling, in the
second mode.