Isleworth Mona Lisa
According to Leonardo's early biographer Giorgio Vasari, Leonardo had started to paint "Mona Lisa" in 1503, but "left it unfinished". However, a fully finished painting of a "certain Florentine lady" surfaced again in 1517, shortly before Leonardo's death and in his private possession. The latter painting almost certainly is the one that now hangs in the Louvre. Based on this contradiction, supporters of the authenticity of the "Isleworth Mona Lisa" claim it is the unfinished "Mona Lisa", made at least partially by Leonardo, and the Louvre "Mona Lisa" a later version of it, made by Leonardo for his own use.
Madeline (video game series)
"Madeline 1st and 2nd Grade Math," was the final entry in the series, and was released as a two CD-ROM set on July 12, 1999. The discs were also sold separately as "Madeline 1st Grade Math" and "Madeline 2nd Grade Math". Set in the Louvre and the Musée d'Orsay, Madeline guides the player through nine works of art, each given a Madeline genre name change, such as the Mona Lisa being reimagined as "Mona Clavel" after Miss Clavel, the headmistress of Madeline's school. Each topic is organized around a painting teaching addition, subtraction, and multiplication. The game was released on the 60th anniversary of the publication of the first Madeline book ("Madeline") in 1939.