How film (the technology, not the art form) works

Film has been essentially unchanged for more than a century. The biggest advance was the addition of sound 90 years ago, followed by color; everything else is incremental upgrades.

Compare that with the churn of audio recording technology during the same period: Wax cylinders, vinyl disks, 8-tracks, cassettes, CDs, and now digital.

Film is, finally, being eclipsed by digital projection, and will likely be dead technology soon. But film is still hanging on.

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