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The essence of a marble structure is to regard a game-location including the characters present as placeholders for clues.
Like a marble in a closed bag of marbles are the clues hidden from view.
Every encounter either with the environment or another participant is regarded as a possible situation that would give the player access to another clue. This could be a character(not player), objects, piece of scenography or even a view of the landscape that gives the player a clue on how to solve a prewritten puzzle or mystery.
The trick is that a player would need a minimum number of clues before being able to realize the hidden truth.
Also usually there are at any given game parallell storylines.