在电脑特效尚未诞生的年代，导演们用智慧与巧思征服了太空、幻影与时空。一根浮空的钢笔、一个会膨胀的脑袋、一道隐形的轮廓……每一帧都藏着令人惊叹的“不可能”。这些老电影的魔法，至今仍让人心驰神往。
This is a scene from Stanley Kubrick's 2001: A Space Odyssey released in 1968.
This was before computers and digital effects.
So, how do you think he made this pen float in space?
The obvious answer is string, but this would get tangled up every time the pen rotated and would ultimately be impossible to hide.
The real trick behind the shot was simple but extremely effective.
The pen was attached to a large piece of glass with double-sided tape and placed in front of the camera.
The glass was attached to bearings that allowed an operator to slowly move and rotate the glass to mimic the floating movement.
It was incredibly simple, but the end result was perfect.
This is just one of many creative tricks that allowed filmmakers to pull off crazy visual effects, all before computers and CGI.
They managed to duplicate heads, make characters invisible, turn miniatures into enormous movie sets, and even invent a green screen alternative that worked better than today's digital methods.
