More fun. What if it wasn't "terraformed" by humans?

For that matter, if there are natives on a planet, what affect will *their* "spirituality" have on things?

If magic, spirits, gods etc are real, then you *definitely* need to take the locals into account.

Heck, even among humans you get big differences. If you've ever seen shogun, one of the interesting historical bits is that the Jesuits in Japan at that time started wearing orange instead of black, because that was what the Japanese priests and monks wore. Black signified something else that wasn't appropriate. and then there was white being the color for mourning...