"His most famous work, the Today Series (1966–2014), is an accumulation of thousands of "Date Paintings". In these works the date on which the painting was made is meticulously painted in white sans serif text, at the centre of a canvas coated with flat colour, with the month spelled out in the language of the place where it was made (unless the Roman alphabet was not used for the first language, in which case Kawara resorted to Esperanto). The paintings were produced in more than 112 cities worldwide. If a Date Painting was not finished by the end of the day, by midnight, he would destroy it."