Moiré oval mirror by Kajsa Willner Dimensions: 50 x 1.6 x 80 cm Materials: Mirror, polyester Playing with imperfect alignments, a small displacement, rotation or difference in the period to make interference patterns occur that lead to the impression of a three-dimensional effect. Moiré patterns are not really there; they are an optical illusion created in the image in your eye. A slight motion of one of the objects creates large-scale changes in the moiré pattern. These patterns can be used to demonstrate wave interference, but also the illusion of a three-dimensional depth in the relationship between human, object and motion.