I immediately though of the Piers Anthony series starting with The Blue Adapt, where there are two parallel worlds, Proton and Phaze - one scientific, located on an airless planet, with folks living in domes, and the other magical - with a phase "curtain" that some folks can use to pass from one to the other...

Don't think I'll have time to enter this month, but that will be my entry if I do....

-Rob A>