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.
Lifelike experience
Lifelike experience is an idea which has evolved since the time when a painting was considered lifelike. Leonardo di ser Piero da Vinci’s Mona Lisa is famous for the ambiguity of the subject's expression, the monumentality of the composition, and the subtle modeling of forms and atmospheric illusionism which contributed to the continuing fascination of the work. A whole painting technique has been created pursuing the goal of the lifelike art form, called trompe-l'œil, involving extremely realistic imagery in order to create the optical illusion that the depicted objects appear in three dimensions.