Exchange from Oskar
at IPP 12 , Tokyo 1992


Fringe Slides

Fringe Slides is a set of six slides with thin line patterns on them. The
lines patterns are slightly different at each slide, both the angle and the
line spacing. When you put two slides on top of each other, then you see
Moiré fringes. The object is to make three pairs, such that the resulting
three fringe patterns are identical. Only one of the 15 possible
combinations gives three identical fringe patterns, but the are several near
misses, where two of three are identical.