Pedro Almodovar's short is, as the credits state - "freely adapted" from a Jean Cocteau stage production. Almodovar retains the central conceit of the play as it essentially is a monologue with a woman on a telephone talking with a lover (the other voice is never heard). Almodovar includes a brief prologue and he winks at the viewer by 'revealing' the artificiality of his own production. He also revels in his usual saturated color schemes.
Fortunately, the woman is played by Tilda Swinton who has to carry the full half hour alone. Almodovar wisely has shaped the material (for the first time in English) around Swinton's talents and she carries it off for the most part, even if some of the eccentricities the Writer-Director don't really work.