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The noun(s) in the following passage:
Artists create art to communicate ideas, thoughts, or feelings. They use a variety of methods—painting, sculpting, or illustration—and an assortment of materials, including oils, watercolors, acrylics, pastels, pencils, pen and ink, plaster, clay, and computers. Artists' works may be realistic, stylized, or abstract and may depict objects, people, nature, or events.
What are "Artists," "art," "ideas," "thoughts, "feelings," "methods," "materials," "oils," "watercolors," "acrylics," "pastels," "pencils," "pen," "ink," "plaster," "clay," "computers," "works," "objects," "people," "nature," "events"?