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Occasionally it becomes very important to remember that the interpretation attaching to the indirect things is not necessarily real, just useful. A good example of this is the idea of the electromagnetic field. Very important in classical EM, but starts to look distinctly less real in the Feynmann approach (glossing over a lot of technical stuff).
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Very true.
The electromagnetic interaction between a positron and electron via a Feynmann diagram is most intriguing as it suggests that a positron is nothing more than an electron travelling backwards in time.
Steven