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Velasco's team employs a visual model often referred to as a "billiard" to illustrate the classical mechanics of linear versus chaotic systems.

A man peered out the doorway of a billiard hall.

A circus, ballroom, arcade, dining hall, billiard room, zoo and ice rink were all available for the public to enjoy before falling into permanent decline.

Assume that the billiard is perfect: the walls are perfectly bouncy, there are no other objects on the table, the motion of the ball is frictionless, and so on.

He gave me a little money—fifty francs, I think, which I lost the same night in a billiard parlor.