Roger Zelazny wrote a multi-volume series called the Amber chronicles. It takes places in different dimensions where the laws of physics change. The characters slide from one dimension to another and find that guns don't fire because gunpowder does not ignite for example, because in that dimension the rouge in cosmetics is used in its place. Has anybody read this? I am asking because I find the last few volumes less interesting the the beginning volumes and wonder if others think so too.
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