Two large groups of motifs determine the content of Hundertwasser's painting: one comprises a world of forms representing analogies to vegetative growth and an animistic nature; the other is the repetitive use of architectural code symbols: houses, windows, gables, fences, gates. It is one of the idiosyncrasies of Hundertwasser's art that both motif groups are inextricably linked: vegetative forms seem static, to solidify to architecture in order to last, whereas everything constructed seems to have grown organically, to have been produced by nature herself.
His painting technique is also his very personal affair. Hundertwasser likes best to use paints he has pulverised or prepared himself, which he applies without mixing. Similarly, he prepares the priming ground himself; for prime coating, paint mixture and varnish he has developed various recipes of his own, all of which are designed to guarantee a long life for his pictures.
In many of his pictures he uses oil, tempera and watercolour techniques in one picture to achieve a contrasting effect between the matte and radiant parts of the picture.
Wieland Schmied, in: Hundertwasser – KunstHausWien, Cologne: Taschen Verlag, 1999.Hundertwasser's colour! There is no limit to its sensuality; it grows richer and richer, in a triumphant, exuberant warmth; greens, blues, and luminous violets exalting the shrill carmines, vermilions, and yellows; and still more sumptuous when the vividness is heightened by applying genuine gold and silver foils. Before such a feast for the eyes one forgets that up until 1957 he had been living on the edge of survival, virtually deprived of everything, for all his meagre requirements and legendary sobriety. One forgets, too, that he had unfolded treasures of ingenuity in the recovery of scraps and trash-can rakings and by painting on anything, with anything, provided it would last – which indeed it has done, as well as if not better than the newest and most costly materials.
Pierre Restany, in "Happy Hundertwasser", 1976, published in: Hundertwasser,
New York: Parkstone Press International, 2008
Hundertwasser never really created large editions of one and the same graphic work. His graphic editions comprise several colour versions and variants, which are not numbered separately, but instead numbered throughout the entire edition. It was his aim to make many different unique pieces within the art of the graphic, thereby going beyond machine production.
Hundertwasser always took great care to provide exact information about the work on each graphic sheet, in order to arrive at as complete a disclosure of a work's techniques and creation dates as possible.
All Hundertwasser tapestries that have been executed afterwards by weavers of Hundertwasser's choice have been created without cardboard templates.
When transforming his works into a tapestry, Hundertwasser's main concern was to have this done freehand – a transmission of one of his works into a different medium and the quality of the artistic interpretation by the weaver without pattern or cardboard template. In Hundertwasser's opinion, only this procedure, without a cardboard template, could breathe life into the work, thus an authentic work of art could evolve and not just a soulless copy of the model.
This is the reason why all Hundertwasser's tapestries are unique works..
As early as 1958, Hundertwasser formulated in his „Mouldiness Manifesto Against Rationalism in Architecture" his denouncement of rationalism, the straight line and functional architecture.
In 1968 Hundertwasser presented his manifesto „Los von Loos (Loose from Loos) – A Law Permitting Individual Building Alterations or Architecture-Boycott Manifesto". For Hundertwasser the tradition of rational, sterile architecture with its deadly monotony begun by the Austrian architect Adolf Loos was responsible for people's misery. He called for a boycott of this architecture and promoted creative freedom to build and the right to individualise buildings.
As an architectural doctor he took on the responsibility of transforming ugly, monotonous and sterile buildings.
In numerous exemplary architectural projects that Hundertwasser was able to realise from the 1980s onwards, he drove a path out of the cul-de-sac of modern architecture. His buildings are witness to his encouragement of diversity over monotony, for romanticism, for the organic and for unregimented irregularity, for spontaneous vegetation and for a life in harmony with nature.