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In tennis, measurement - specifically, judging whether a ball is in or out - is particularly crucial. And in the new ESPN Films 30 for 30 short "Subject to Review" comes a close look at not just the technology that's been developed to determine the right calls with better accuracy, but the meaning and significance of that pursuit . Tracing the history of photographic review back more than a hundred years, and chronicling controversial moments before and after the age of review in tennis, the film explores the mechanisms of the cameras and computerized simulations that now serve as the final word on close calls - but also the limits of the veracity of those calls . Ultimately, it's a story about technology in sports - but also a study of what we want from our machines, and our minds, well beyond any court of play.