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In whatever I may be thought to have been unnatural, unwise and indelicate, it is now my most fervent desire it may have a suitable impression on you - and on me, a penitent for every wrong thought and step.

The first rule of world-building is available physics, which basically means that if you want it to feel real, it has to follow the same rules as this world, from gravity to how human behaviour works. If you have a fantasy element that doesn't obey the laws of physics, make sure that it has a fantasy explanation.