It is well known that in Super Mario 64, the mirror room in Peach's Castle is not an actual mirror (since the Nintendo 64 would be incapable of creating real-time reflections in this manner) and is instead merely a copy of the room behind a pane of glass.
The mirror side of the room contains Mirror Mario, who is a separately coded object from Mario and as such is subject to several discrepancies that make him perform different actions from the real Mario under specific circumstances.
The biggest discrepancy is what happens when Mario actually enters the Snowman's Land wall/painting. Since the real Mario unloads at that point, and Mirror Mario is programmed to copy whatever real Mario is doing (but cannot himself unload), he assumes a standard pose (what would be a T-pose in most games, but is an A-pose in this one) instead.
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