Moire Kit - where do the patterns come from?

This pack comprises an in depth investigation into the fascinating properties of Moirés, or interference patterns.

There are 7 sets of screens (18 x 12.5 cm, printed on photographic film, although one set of screens is double size) each demonstrating a different effect. One of the most amazing effects is where the Moiré pattern becomes magnified, when you rotate one screen against the other.

Another amazing effect is when you slide the top screen sideways, and part of the image moves left, and other parts move in the opposite direction!