It's been said that imitation is the sincerest form of flattery. When it comes to problem solving, that may well be true. Copying, or using a simple copy of an object rather than the object itself, can be an effective way to achieve a desired goal. This may be done physically or optically, such as by using an image of some sort. Once you have a copy, you can change it in 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. So next time you're stuck on how to solve a problem, remember that copying may be the answer.