In 1965, in his studio in Warsaw, Opałka began painting numbers from one to infinity. Starting in the top left-hand corner of the canvas and finishing in the bottom right-hand corner, the tiny numbers were painted in horizontal rows. Each new canvas, which the artist called a 'detail', took up counting where the last left off. Each 'detail' is the same size (196 x 135 cm), the dimension of his studio door in Warsaw. All details have the same title, "1965 / 1 – ∞"; the project had no definable end, and the artist pledged his life to its ongoing execution: 'All my work is a single thing, the description from number one to infinity. A single thing, a single life', 'the problem is that we are, and are about not to be'. He had contemplated and tried many different ways to visualize time before settling on this life's work.