One of the advantages of writing science fiction and fantasy is your ability to stretch the truth. One of the disadvantages is stretching the truth to the point where it is so outlandish that it is no longer believable by anyone except those who are willing to suspend their belief and buy into your brand of radical storytelling.

Just think of political advertising and you’ll understand. There are those who are not going to believe any of it, those who are going to believe some of it, and those who are going to believe all of it. The majority are going to be in the middle.

If you place your characters in a world where everything is upside down, it’s not enough that you do. You must base their existence on scientific or theoretical principles or conjecture that logically makes sense.

That doesn’t mean you have to be (or become) an expert in the scientific laws governing the plausibility of your world. You just need to know enough to allow your readers to suspend their beliefs. If you take them from what they know as scientifically factual and accurate, then you must make certain they can accept a world where people live within the realm of something like living upside down is possible.

Indicating the accepted scientific laws in one universe do not apply in another could be one way of explaining things.

A lot of science fiction stories have characters argue the laws of physics can’t be changed. That’s physics as they (you) know it.

Imagine trying to convince someone who lived during the Black Death that the cause for the plague was bacteria-carrying fleas and not cats or evil spirits. Or explaining how a light switch works to someone from the Salem Massachusetts witch-hunting days. You just might find yourself on trial as one.

Keep in mind what Isaac Asimov said about advanced cultures and you pretty much can’t go wrong.

— “Any sufficiently advanced technology is indistinguishable from magic.”