What was the motivation for impressionism?

In Paris Monet met Renoir, Sisley and Bazille. The four artists formed the foundation of the Impressionist movement.

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Impressionism is derived from the title of a Claude Monet work, Impression, Sunrise (Impression, soleil levant). The critic Louis Leroy gave rise to the term Impressionism when he wrote a satiric review of the aforementioned art piece.