ABOUT 20 YEARS ago, Alex Hirsch, a student at the California Institute of the Arts in Santa Clarita, set out to make a low-budget short animated film that he hoped would become a demo reel one day. It was called “Gravity Falls” … you have perhaps heard of it, yes?

Hirsch used the 11-minute reel to pitch Disney on his show, and they snapped it up. To say it was a success is to understate things quite a bit; when it debuted in 2012 the show was probably the biggest new thing on The Disney Channel that year.

Gravity Falls is the adventures and misadventures of a pair of 12-year-old fraternal twins who are sent off to spend the summer with their great-uncle Stan, who has converted his A-frame cabin deep in the backwoods of Oregon into a tourist trap that he calls “The Mystery Shack.”

The inspiration for the show, Hirch told reporters, was the “mystery” type roadside attractions that he used to visit with his family when he and his twin sister were young. Places like “The Mystery Spot,” a short distance from his home in the San Francisco Bay area — and the attraction that inspired The Mystery Spot: The Oregon Vortex and House of Mystery, near the town of Gold Hill. (For text and pictures, see https://offbeatoregon.com/2510a1002d.oregon-vortex-keeps-experts-guessing-709.063.html)