What exactly is a character conjuring? Is it a ghost, a construct made out of raw force, their astral/ethereal/etc body part? Do they choose the side of the hand (left or right)? Could they summon other body parts or something more abstract (like a force tentacle, i.e. arm of Hadar, from the ground)? Could it have a wrist, or a sleeve, or a bracelet?
I’m asking about the lore side of this spell in different editions of D&D, so my question is focused on different source materials (e.g. official books, magazines, maybe tweets etc) and what the Mage Hand has been classified as across editions.