From “Quantum Theory In Ten Minutes“:
Notice that in all of the above discussion, when we did the transform, we didn’t look inside of the box. If we did, however, look inside the box, in either the classical or quantum case, we would see a duck or a turkey and we would immediately update our description to reflect this. This is called the “collapse postulate” and is the source of a great deal of bickering in the quantum world. In the classical world no one bats an eyelash at updating their description. Most physicists take the point of view that you shouldn’t bat your eyelash at the same process in quantum theory. (But not all physicists agree on this.) From a pragmatic point of view, you can use the above procedure without flinching.
Ouch, my brains.
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