Yayoi Kusama was born on 22 March 1929 in Matsumoto, Nagano She was born into an affluent family of merchants who owned a plant nursery and seed farm, Kusama started creating art at an early age and began writing poetry at age 18. Her mother was not supportive of her creative endeavors; Kusama would rush to finish her art because her mother would take it away to discourage her. Her mother was also apparently physically abusive, and Kusama remembers her father as "the type who would play around, who would womanize a lot". The artist says that her mother would often send her to spy on her father's extramarital affairs, which instilled within her a lifelong contempt for sexuality, particularly the male body and the phallus: "I don't like sex. I had an obsession with sex. When I was a child, my father had lovers and I experienced seeing him. My mother sent me to spy on him. I didn't want to have sex with anyone for years. The sexual obsession and fear of sex sit side by side in me." Her traumatic childhood, including her fantastic visions, can be said to be the origin of her artistic style.
When she was ten years old, she began to experience vivid hallucinations which she has described as "flashes of light, auras, or dense fields of dots". These hallucinations also included flowers that spoke to Kusama, and patterns in fabric that she stared at coming to life, multiplying, and engulfing or expunging her, a process which she has carried into her artistic career and which she calls "self-obliteration". Kusama's art became her escape from her family and her own mind when she began to have hallucinations. She was reportedly fascinated by the smooth white stones covering the bed of the river near her family home, which she cites as another of the seminal influences behind her lasting fixation on dots.
When Kusama was 13, she was sent to work in a military factory where she was tasked with sewing and fabricating parachutes for the Japanese army, then embroiled in World War II. Discussing her time in the factory, she says that she spent her adolescence "in closed darkness" although she could always hear the air-raid alerts going off and see American B-29s flying overhead in broad daylight. Her childhood was greatly influenced by the events of the war, and she claims that it was during this period that she began to value notions of personal and creative freedom.
She went on to study Nihonga painting at the Kyoto Municipal School of Arts and Crafts in 1948. Frustrated with this distinctly Japanese style, she became interested in the European and American avant-garde, staging several solo exhibitions of her paintings in Matsumoto and Tokyo in the 1950s.
By 1950, Kusama was depicting abstracted natural forms in watercolor, gouache, and oil, primarily on paper. She began covering surfaces—walls, floors, canvases, and later, household objects, and naked assistants—with the polka dots that would become a trademark of her work.
The vast fields of polka dots, or "infinity nets", as she called them, were taken directly from her hallucinations. The earliest recorded work in which she incorporated these dots was a drawing in 1939 at age 10, in which the image of a Japanese woman in a kimono, presumed to be the artist's mother, is covered and obliterated by spots. Her first series of large-scale, sometimes more than 30 ft-long canvas paintings, Infinity Nets, were entirely covered in a sequence of nets and dots that alluded to hallucinatory visions.