Production of collage involves the use of the following except

Explanation

Clay is for three-dimensional sculpture work. Collage uses flat materials glued to surfaces. Clay does not work in this flat technique.

Cardboard, magazines, and gum all work for collage. Artists cut and paste these materials. Clay needs shaping, not cutting and gluing.

Collage builds layers of flat items. The materials must stick to surfaces. Clay belongs to modeling and ceramics instead.