These days, kids identify them by the aspect ratio.

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[–] 4 points 3 years ago

No, that was just for effect. Notice that all the scenes playing in Kansas are B&W (even the ones at the end), and all of Oz was in Color. It gave the place an extra kind of quality above the B&W pictures they were used to. I have heard that people in the cinemas gasped in surprise when the switch happened.

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