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I like to imagine conjuration as fundamentally a school of transportation. When you conjure a chair, you're not actually creating a chair from nothing. That chair already existed somewhere in the multiverse from one of the infinite number of planes/demiplanes. Your spell merely teleports a chair of your description to you. This makes sense because of the following.
1) It explains why spells of creation fall into the same category as summoning and planar travel. They all work the same way.
2) It explains why created items disappear after a duration. After the duration, the item returns to its normal location.
3) GameMastery Guide illustrates there exists an infinite number of unusual demiplanes, giving the demiplane of cats and the demiplane of sentient tumors as explicit examples. There might be a demiplane for anything a conjurer "creates."
4) There's a god that owns a vault filled with a copy of every item in the multiverse.
I also had fun thoughts of polymorph spells working like this, too. When you transform, you're actually swapping bodies with something else in the multiverse.