When I first made a grid I happened to be thinking of the innocence of trees and then this grid came into my mind and I thought it represented innocence, and I still do, and so I painted it and then I was satisfied. I thought, this is my vision.
Notes from Wikiquote
One of her first grid paintings she made in New York in 1964, it was [ titled 'The Tree']. Martin often described this painting as her first grid. In fact, she had been making them since at least the beginning of 1960's