On January 4, 1966, On Kawara began his Today series, or Date Paintings. He worked on the series for nearly five decades. A Date Painting is a monochromatic canvas of red, blue, or gray with the date on which it was made inscribed in white. Date Paintings range in size from 8 x 10 inches to 61 x 89 inches. The date is composed in the language and convention of the place where Kawara made the painting. When he was in a country with a non-Roman alphabet, he used Esperanto. He did not create a painting every day, but some days he made two, even three.