Final answer:
Contemporary art in the 21st century involves diverse materials and media, with installation art being a popular form of expression.
Explanation:
Contemporary art in the 21st century is characterized by the use of a wide variety of materials and media, including digital technologies like digital imaging and the Internet. Artists freely mix media to best convey their concepts and purposes, ranging from large-scale projects to DIY endeavors. Installation art is a common form of contemporary art, involving the creation of art within a specific environment or combining video with traditional media like sculpture.
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