The phenomenon of mirroring in psychotherapy supervision is a potentia
lly valuable teaching tool, not often used in those settings where it
is most likely to occur. Using a case illustration, this article illus
trates known factors that facilitate mirroring (such as treatment impa
sses, therapeutic blind spots, unconscious identifications, temporary
regressions in therapist or supervisor, or other interpersonal process
es) and then describes the previously unrecognized impact of the thera
peutic milieu on the occurrence of mirroring. Consideration of the the
rapeutic milieu allows the identification of situations in which mirro
ring is most likely to occur and those in which mirroring can be false
ly suspected. It provides a useful addition to recent conceptual model
s of the mirroring process.