Why did Leonardo da Vinci painted two Virgins of the Rocks? which one do you like more? why? what are the differences?

It's in the news that the Louvre (left painting) and the London's National Gallery of Art (right painting) are going to reunite them for sometime for display. http://www.huffingtonpost.com/2011/07/27/two-versions-of-leonardos_n_911275.html

This is a historic agreement between the two prestigious galleries. It's also an epic time for Leonardo critics to see the two paintings side by side. We might get a better glimpse and meaning of the difference between these masterpieces done by the great Leonardo.

An excerpt and analysis from Leonardo's notebooks on rocks and landscapes:

The colours of the shadows in mountains at a great distance take a most lovely blue, much purer than their illuminated portions. And from this it follows that when the rock of a mountain is reddish the illuminated portions are violet (?) and the more they are lighted the more they display their proper colour

Probably, he was talking about what he applied on the painting on the right?

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