This little sketch comes from 1965; it’s concept art for Space Mountain, which was then under development for Disneyland’s New Tomorrowland. The ride, of course, wouldn’t open until 1975, and then only in Florida. It wouldn’t appear at Disneyland until 1977.
I have absolutely no profound reason to post this piece, aside from the fact that I just thought it was a neat little sketch. Also, I never fail to find it surprising that they were working on Space Mountain way back in 1965.