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TRIZ 40 Principles
Creative tools > TRIZ Contradiction Analysis > Principles
26. Copying
Rather than use the expensive, delicate or inaccessible original, can you use a simple copy. This may be done physically or optically, such as using an image of some sort. Once you have a copy, you can change it different ways to achieve the desired benefit. Image intensifiers work by taking a copy of the light available and amplifying it. It may, for example, be easier to measure a copy of an object than the object itself.