With The Master Builder, we have a play that hardly justifies its place in the canon of Ibsen's 'realist' plays. True, the characters have motivations based in psychology, and there are no magical elements to the play. Indeed, even the hero's suggestion that he achieves things by willing them could be his imagination, or a symptom of madness, as his wife fears.
However, the behaviour of the characters and the meaning of their action seem to have little basis in reality. Also the play seems to strive at allegory and metaphor, though as ever in Ibsen it is best not to tie the meaning down too tightly.
The story centres on Halvard Solness, a talented architect. He has overstepped his onetime rival, Knut Brovik, who now works for him. However, there is a price for his success. His chance to build came about when his house burned down. This led to the deaths of his children, and his wife has never recovered from these losses, leaving him in a guilt-ridden painful marriage.
Halvard also fears youth, especially the son of Knut, Ragnar Brovik, who, Halvard fears, may one day overstep him, as he did Knut. For this reason, he is having an affair with Ragnar's fiancé in the hope that this will keep Ragnar in a position of subservience to him.
Into this atmosphere of guilt and angst steps Hilde Wangel, the younger daughter from Ibsen's earlier play, The Lady From The Sea. Hilde is in love with Halvard and wishes to inspire him to great deeds. Under her influence, Halvard begins to revive and dream again. He agrees to mount the high tower he is building, but his vertigo returns and he plunges to his death.
Described in these terms, the story sounds straightforward, but a reading of the play suggests that it is somehow about other things than the mere narrative would suggest. Ibsen's biographer, Michael Meyer, has called the play, Portrait of the Artist as an Old Man, and certainly the play does seem to reflect Ibsen's sense of himself as a writer.
To note the parallels. Like Halvard and Knut, Ibsen had overtaken Bjoernson as the prominent writer of Norway. However, Ibsen had felt threatened by a younger writer, Knut Hamsun, who criticised Ibsen's 'old-fashioned' style. This is echoed in the relationship between Halvard and the young Ragnar. (Ibsen's fears, incidentally, were unjustified - Hamsun's works are nowhere near as great as Ibsen's.)
We may also trace something in the progress of Halvard's buildings. He began by building churches with spires until his disillusion with god. Later, he built homes for people to live in, but felt that these carried an echo of his own unhappy home and that people were not happy in them. Finally, he seeks to build castles in the air with solid foundations beneath. We can see an echo in Ibsen's plays - the earlier fantasy plays, the realistic prose plays and finally the return to something more fantastic, but with a realist base.
We can also detect something phallic in the obsession with spires. Certainly, Hilde is fascinated with Halvard's building of tall towers, and her ecstasy at the end (she hears the sound of singing and harps) might suggest an orgasm.
However, the play is more than allegory, and we deal with actual characters - not realistic, perhaps, but built on solid motivations that we can care about. We feel compassion for Halvard's weight of guilt and the sadness of his marriage to a colder wife, obsessed with duty. Notably, it is her commitment to the dead weight of duty (rather than love) that kills her babies (appropriately it is her mother's milk that poisons them) and prevents her from being around to persuade Halvard from climbing the tower.
There is an interesting moment in The Wild Duck where the realist, Relling tells the foolish idealist, Gregers Werle (a rather more self-deprecating self-portrait by Ibsen) that he is too obsessed with hero worship, rather than believing in himself. Notably, Ibsen seems to occasionally have this hero worship for his characters.
Hence Halvard's ill-treatment of Knut, Ragnar, Kaja (Ragnar's fiancé) and perhaps his wife is treated more as a part of Halvard's weight of guilt and a reason we should feel sorry for him. We are never encouraged to spend too much time worrying about the weaker characters who are cast aside by the hero.
It is also notable that some of Ibsen's lack of self-belief comes across in Halvard. He build perfect homes at a time when his own home life is in ruins. He aims once more to confront god and set himself free, but he proves not up to the task of building those castles in the air with solid foundations and so he falls to his death. The portrait of this artist is of one who is talented, but plagued by self-doubt.
Overall, the play is ambitious and original, full of rich and obtuse dialogue that keeps us interested in the fate of its conflicted hero.