Orpheus in the Underworld

Orpheus followed his love, Eurydice, to the underworld in hopes of bringing her back into the world. With sweet words and music he made his way to Hades and Persephone to plead for his wife. His song brought tears to the throne and Orpheus was permitted to take his love away with him on one condition, that he should not turn around to look at her till they should have reached the upper air. Under this condition they proceeded on their way, he leading, she following, through passages dark and steep, in total silence, till they had nearly reached the outlet into the cheerful upper world, when Orpheus, in a moment of forgetfulness, to assure himself that she was still following, cast a glance behind him, when instantly she was borne away…

And still every time I turn to gaze the vision wavers and disappears.