Speculations about Mona Lisa
The 16th-century portrait Mona Lisa, or La Gioconda (La Joconde), painted in oil on a poplar panel by Leonardo da Vinci, has been the subject of a considerable deal of speculation. == Columns and trimming == It has for a long time been argued that after Leonardo's death the painting was cut down by having part of the panel at both sides removed.
Source: Wikipedia — Speculations about Mona Lisa (CC BY-SA 4.0)