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Moiré patterns with wire mesh
When you look through one wire mesh element at another, you sometimes see a pattern of light and dark lines that shifts as you move. This pattern is called a moiré pattern.
Moiré patterns are created whenever one semitransparent object with a repetitive pattern is placed over another. A slight motion of one of the objects creates large-scale changes in the moiré pattern.
The moiré pattern is not a pattern in the screens themselves, but rather in the image formed in your eye. Black lines on the front screen hide the clear lines on the rear screen, creating a dark area. Where the black lines on the front screen align with black lines on the rear, the neighboring clear areas show through, leaving a light region. The patterns formed by the regions of dark and light are moiré patterns.
If two wire mesh elements are exactly lined up, then no moiré pattern appears. The slightest misalignment of the two elements will create a large-scale, easily visible moiré pattern. As the misalignment increases, the lines of the moire pattern will appear thinner and closer together. Moiré effects on wire mesh elements often look like water running down the screens.
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