The psychic emanator is a special building only found through world quests. When powered it projects an aura in a 15 square radius around itself that provides a +5 mood bonus. The mood bonus only lasts for as long as a pawn remains within its area of effect.
Due to the combination of its somewhat short range and no lasting effect its advised to place it either in a hospital to help negate some of the negative effects of being bedridden with an illness, near prison cells or a chronically depressive pawns bed/work space. Because of the low beauty and high value of the emanator, you can wall it in to reduce the effect of its unattractiveness and prevent angry pawns from destroying it during a tantrum.