A complete list of archetypes cannot be made, nor can differences between archetypes be absolutely delineated. For example, the Eagle is a common archetype that may have a multiplicity of interpretations. It could mean the soul leaving the mortal body and connecting with the heavenly spheres. Or it may mean that someone is sexually impotent, in that they have had their spiritual ego body engaged. In spite of this difficulty Jungian analyst June Singer suggests a partial list of well-studied archetypes, listed in pairs of opposites: