Leonardo da Vinci began painting the Mona Lisa in 1502 (during the Italian Renaissance) and, according to Vasari, completed it in four years. Leonardo took the painting from Italy to France in 1516 when King François I invited the painter to work at the Clos Lucé near the king's castle in Amboise. The King bought the painting for 4,000 écus and kept it at Fontainebleau, where it remained until moved by Louis XIV.
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. Early copies depict columns on both sides of the figure. Only the edges of the bases can be seen in the original.[3] However, some art historians, such as Martin Kemp, now argue that the painting has not been altered, and that the columns depicted in the copies were added by the copyists. The latter view was bolstered during 2004 and 2005 when an international team of 39 specialists undertook the most thorough scientific examination of the Mona Lisa yet undertaken. Beneath the frame (the current one was fitted to the Mona Lisa in 2004) there was discovered a "reserve" around all 4 edges of the panel. A reserve is an area of bare wood surrounding the gessoed and painted portion of the panel. That this is a genuine reserve, and not the result of removal of the gesso or paint is demonstrated by a raised edge still existing around the gesso, the result of build up from the edge of brush strokes at the edge of the gesso area.
The reserve area, which was likely to have been as much as 20 mm originally appears to have been trimmed at some point probably to fit a frame (we know that in the 1906 framing it was the frame itself which was trimmed, not the picture, so it must have been earlier), however at no point has any of Leonardo's actual paint been trimmed. Therefore the columns in early copies must be inventions of those artists, or copies of another (unknown) studio version of Mona Lisa. The round objects each side of the sill remain as mysterious as so much of this painting.
