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Message: <blockquote data-quote="S'mon" data-source="post: 2116960" data-attributes="member: 463">BTW Woodelf I do agree that rules affect the flavour of the game, which is one reason I'd use different rules for different sorts of game even within the same fantasy gameworld.  To me saying that rules are the physics of the world implies that the rules are immutable, whereas in fact the rules are highly malleable.  The physics of the world I generally take to be an overarching constant (eg gravity, electromagnetism, nature of spirits), with a partial exception for the physics of magic, which IMC can change over time and differ from place to place.To take a different example, I have run lots of PBEMs set on Earth in the recent past, present and near future.  I use different rules for different games, even where the games are linked (ie are not 'alternate' Earths) without the physics necessarily differing.I do have rules for world's physics differing within the same game campaign, derived from 1e Manual of the Planes, I assign worlds a relative Magic Factor (how powerful magic is), Physical Factor (how closely the physics adhere to the real world, as we currently understand it) and a Reality Factor (to what extent this world's physics dominate those of extraplanar visitors, or are dominated in turn - magic artifacts usually have a higher RF than their homeworld and thus 'create their own reality' to some extent).</blockquote>