Forty years ago, BBC Horizon released a documentary called "𝗛𝗼𝘄 𝘁𝗼 𝗙𝗶𝗹𝗺 𝘁𝗵𝗲 𝗜𝗺𝗽𝗼𝘀𝘀𝗶𝗯𝗹𝗲."

They visited Industrial Light & Magic to show how the magic was made.

In this segment, you get a step-by-step look at optical compositing for a spaceship shot, why alignment within 𝘁𝗵𝗼𝘂𝘀𝗮𝗻𝗱𝘁𝗵𝘀 𝗼𝗳 𝗮𝗻 𝗶𝗻𝗰𝗵 matters, and how being off by a hair creates those telltale 𝗯𝗹𝗮𝗰𝗸 𝗵𝗮𝗹𝗼𝘀 around the edges.

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