Wagner uses the metaphor of Day and Night in the second act to designate the realms inhabited by Tristan and Isolde. The world of Day is one in which the lovers are bound by the dictates of King Marke's court and in which the lovers must smother their mutual love and pretend as if they do not care for each other: it is a realm of falsehood and unreality. Under the dictates of the realm of Day, Tristan was forced to remove Isolde from Ireland and to marry her to his Uncle Marke – actions against Tristan's secret desires. The realm of Night, in contrast, is the representation of intrinsic reality, in which the lovers can be together and their desires can be openly expressed and reach fulfilment: it is the realm of oneness, truth and reality and can only be achieved fully upon the deaths of the lovers. The realm of Night, therefore, becomes also the realm of death: the only world in which Tristan and Isolde can be as one forever, and it is this realm that Tristan speaks of at the end of act 2 ("Dem Land das Tristan meint, der Sonne Licht nicht scheint"). In act 3, Tristan rages against the daylight and frequently cries out for release from his desires (Sehnen). In this way, Wagner implicitly equates the realm of Day with Schopenhauer's concept of Phenomenon and the realm of Night with Schopenhauer's concept of Noumenon. While none of this is explicitly stated in the libretto, Tristan's comments on Day and Night in acts 2 and 3, as well as musical allusions to "Tristan" in "Die Meistersinger von Nürnberg" and "Parsifal" make it very clear that this was, in fact, Wagner's intention.