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Cake day: June 20th, 2023

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  • There are two categories of phenomena we can distinguish, which I will call observer-independent and observer-dependent phenomena. Examples of observer-independent phenomena are metals, molecules, mountains and minds. Observer-dependent phenomena include money, marriage and digital computation. A metal is what it is and does what it does regardless of what we say about it. But money is only money because we say so.

    The metals, plastics and other materials in a computer are observer-independent. That they are carrying out a computation is observer-dependent.

    An observer-dependent phenomenon cannot logically be the cause of an observer-independent phenomenon.