Just learned that Ralph McQuarrie died. As a Star Wars fan, I've known of this guy for 30+ years. Pretty much everything you can picture from the original trilogy was invented by him. George Lucas would say to him that he wanted a bad guy with a mask and a cape, and he would draw Darth Vader. The sets, the costumes, the ships. All of it was built to designs that he came up with.
If you go back and look at his art, you can see how his concepts evolved with feedback from Lucas.
Some of the first McQuarrie concept sketches of Vader:
