Thought this was interesting

Technically exquisite, The Persistence of Memory is one of what Dalí called his “handpainted
dream photographs” and can simultaneously be read as a landscape, a still-life,
and a self-portrait. The effect of such a tour de force was not lost on Dalí, and from the
1930’s forward, melting watches appear regularly in his artwork—most significantly,
perhaps, in a “revision” of the original painting completed in 1954 and titled The
Disintegration of the Persistence of Memory. Using many of the same elements as the
original, The Disintegration of the Persistence of Memory represents the significant
changes that Dalí’s life and art underwent after World War II. Considering the succcess
of the 1931 painting, it’s not surprising that Dalí should express his “new self” in terms
of the old. This is the first time that MOMA has agreed to loan The Persistence of
Memory; side by side for the first time in history, the two paintings link not only the two
halves of Dalí’s career, but the two halves of a century as well.

http://thedali.org/education/documents/clocking_in.pdf