Because we live in the physical world, he explains, we're very familiar with physical concepts such as spatial distance, or warmth and cold. (sciencemag.org)
Even after spatial distances between trees and differences in environmental conditions ¬ - which are regarded as major factors affecting how an insect community is shaped ¬ - are factored in, the correlation between the alder's genetic distance and the insect community structure was solid, remaining consistent for the surveyed two years. (sciencedaily.com)
Might what Lewis said about his space travel stories give us any clues about his fantasy writing in general: «No merely physical strangeness or merely spatial distance will realize the idea of otherness which is what we are always trying to grasp in a story about voyaging through space: you must go into another dimension.» (redeeminggod.com)