The three finest Pollack paintings that I have seen IRL include:
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Autumn Rhythm in the Met…
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Lavender Mist in the National Gallery, Washington…
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… and One in MoMA NYC.
All three struck me as far more “open” and airy than works by his imitators. They also had an elegance and a sense of motion… like you could feel the dancing movements from which they were created and clearly illustrated the term “Action Painting”.