Irises

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Painted by Vincent Van Gogh in 1889, during the last year of his life, this painting was considered a "study" by the artist. Images of it, along with thousands of other pieces, have been released into the public domain by the Getty Conservation Research Foundation Museum under their Open Content program. Per their website:

The Open Content Program makes high-resolution images of public domain artwork from the Getty collections freely available, without restrictions, to advance the research, teaching, and practice of art and art history.

The initiative also aims to support and promote the open-access movement among museums and cultural heritage institutions in removing barriers to the use of cultural heritage images.