English: A diagram of a causal loop illustrated with a billiard ball. Top: original billiard ball trajectory. Middle: the billiard ball emerges from the future at a different angle than the original, and delivers its past self a glancing blow. Bottom: the billiard ball changed its trajectory in just the right way so that it will travel back in time with the angle required to deliver its younger self the glancing blow.
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La boule de billard du futur (au milieu à droite) entre en collision avec sa version passé (au milieu à gauche) après voyage temporel, amenant la boule passé à devenir la boule futur, formant ainsi une boucle causale.
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