* Nature and Ecology: Hundertwasser deeply believed in the interconnectedness of humans and nature. His art often depicted lush landscapes, trees, and animals, celebrating the beauty and fragility of the natural world.
* Architecture: He saw architecture as a form of art and believed in creating buildings that blended seamlessly with nature, with curvy lines, organic shapes, and plenty of greenery. His paintings often featured fantastical, biomorphic buildings, highlighting his vision for sustainable and harmonious urban environments.
* Spirals and Circles: These recurring motifs symbolize organic growth, life cycles, and the interconnectedness of all things. He used them to create a sense of movement and energy in his artwork.
* Color and Texture: Hundertwasser loved using bright, vibrant colors and contrasting textures to create visually stimulating and engaging compositions. He often used bold strokes and swirling patterns to convey a sense of movement and life.
* Anti-Geometry and Anti-Rationality: He rejected traditional, rigid geometric forms and embraced the beauty of irregularity and spontaneity, reflecting his belief that art should be a personal and intuitive expression.
In addition to these themes, Hundertwasser also incorporated elements of philosophy, spirituality, and social commentary into his work, often addressing topics like environmentalism, peace, and social justice.