Plein-air painting is painting outside. It was first used (and
given the name plein-air) by the French Impressionists. It is the
same as open air painting.
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The outer edge boarder design and the colors they come in.
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"Open air" or "outdoor" are English equivalents of the French phrase "plein air."
Specifically, the masculine adjective "plein" means "full." The masculine noun "air" is a cognate in French and English. The pronunciation is "pleh-nehr."