Certain interesting image-rotation functions were observed in the Moiré pattern produced by fly's eye lens plates. Each disk-like pattern can act as an imaging-lens capable of producing a“mirror-image”, and rotating the image around the optical axis as a result of the rotation of the plates. It is pointed out that a function of two pseudo-cylindrical lenses, axes of which are at right angles to each other (one is convex and the other concave), is realized by pairs of two micro-lenses arranged in a specific configuration, and they play an important role in this phenomenon.
