20 Things You Didn't Know About Star Wars: Episode IV - A New Hope
9. The Force Could Originally Be Harnessed By Ancient Relics
If the Star Wars prequels' decision to explain the Force as midi-chlorians proved that George Lucas' handle on his own lore was questionable at best, he didn't fare much better during the scripting stages of A New Hope.
Though he eventually settled on the Force as a physically intangible object, earlier drafts of the script included a "Kyber crystal," a Holy Grail-esque artefact capable of harnessing and manipulating the Force.
This is of course before Kyber crystals went on to the become the power source for lightsabers.
The idea of the Force having a physical presence wasn't thrown out entirely, though, being recycled for the 1978 Star Wars novel "Splinter of the Mind's Eye," where "Kaiburr crystals" are ancient Force relics which grant the wearer immeasurable control of the force.