Each "Date Painting" is registered in a journal and marked on a "One Hundred Years Calendar". When Kawara finished a painting, he applied a swatch of the paint mixture he used to a small rectangle that was then glued onto a chart in the journal. Under each colour is a number showing the painting's sequence in that year and a letter indicating its size. The 48 journals therefore record the details of the painting's size, color and newspaper headline, while the calendar uses colored dots to indicate the days in which a painting was made, and to record the number of days since the artist's birth. Kawara created nearly 3,000 date paintings in more than 112 cities worldwide in a project that was planned to end only with his death.