ITC Mona Lisa is a digitization of Albert Auspurg’s 1930 design for Ludwig & Mayer. Jaspert's Type Encyclopaedia [1970] comments that the "modern face design is not unlike the same founders' Firmin Didot."
Note that the Auspurg’s font was an open face. Pat Hickson created Mona Lisa Solid by filling in the open areas.
Don
The font was used in Steven Spielberg's movie "Artificial Intelligence" in for a poem with a message for the "boy."
https://www.youtube.com/watch?v=YUUs7ezHmfk
Here is a still

Captured from web.archive.org on 26 Aug 2014. view this capture