Collage refers to the technique of creating artworks by combining and adhering various materials, such as papers, fabrics, found objects, and acrylic skins, to a surface using Golden's paints, gels, and mediums. The goal is to create unique textures, surfaces, and dimensions. Artists can experiment with different materials, including natural objects, glass, and plastics, but must consider factors like adhesion, lightfastness, and archival quality. Golden Artist Colors provides a range of products, such as Heavy Body and Fluid Acrylics, gels, and mediums, that can be used as adhesives or to create original collage elements, like paint skins. (Source IDs: 1, 3, 4, 6, 7)