Quote Originally Posted by bosssmiley View Post
My intent was transparent like a car windscreen (invisible during use, but doing its job anyway). The players are left free to concentrate on play, rather than on juggling numbers.

Opaque? Yeah, that works too, in the rules are a black box to the players. As a player I have no problems with black box rulesets. "Input > witchcraft happens > output" is, IMO, good from the player's perspective.
Yeah, I guess we're just used to different terminologies. To me, transparent has a connotation of having a transparent case or hood and I can see how the engine runs inside the box.