No one really knows what possessed Pollock to make Lavender Mist between the years 1947 and 1950 on the East End of Long Island where he lived and worked from 1945 onwards where he found his inspiration to make this painting.
He took methods of from his previous paintings of dripping and splattering paint on ceramic, glass, and canvas on an easel to create this one.
He then laid a large canvas on the floor of his studio barn, nearly covering the space and using house paint, he dropped, poured, and flung pigment from loaded brushes and sticks while walking around it.
Read more about Number 1 (Lavender Mist) here