Positive and negative relief
- Positive and negative relief
Positive and negative relief is an art technique that are usually done over graph paper to show a pattern will "pop" up in the page. Sometimes it is considered as an optical trick. [ [http://www.google.com/patents?hl=en&lr=&vid=USPAT5070001&id=rQIpAAAAEBAJ&oi=fnd&dq=Positive+and+Negative+Relief 403 Forbidden ] ]
The technique is done by alternating two contrasting colors, such as black and white, on the grids. A pattern is then drawn over the grids, and the parts of the pattern in the grid will be coloured by the opposite colour that the grid inherits.
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