George Lucas explains how he invented lightsabers

So very great. From The Verge’s post:

There’s one particularly interesting shot around two minutes into the video that shows Obi Wan Kenobi being run through by Darth Vader’s lightsaber. In Lucas’ cut of Episode IV, the blade passes through an ethereal Obi Wan; in the early shot, it rips through his cloak, leaving a trail of fire and the aging Jedi’s upper body hanging in the air as his lower body slumps to the floor.

[Via The Verge]