I. K. Bonset [pseudonym; Theo van Doesburg], La matière denaturalisée. Destruction 2., from the collection of the Fries Museum in Leeuwarden, Friesland, Netherlands. The work is a collage, a type of montage.
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(uncountable) The art or process of doing this.
montage (verb) /mɑnˈtɑʒ/, /ˈmɑn.tɑʒ/
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(transitive) To combine into, or depict as, a montage.