*Spoilers*
:
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Humans were created by the Forrunner
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I stopped reading here, because this is just a theory, there is no solid evidence of this. Personally I think that the Forerunner
are humans.
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Let's assume the Ark is Instillation 01.
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That would work, except the screen at the end of the game shows seven actual Halos. That would mean that there would be eight installations.