Players have an additional tool for experimentation.
Recently, Mojang released snapshot 25w36b for Minecraft. Thanks to one innovation, players have another option for creativity.
The developers introduced "Dummies" — they are described as "technical entities that are spawned by commands and can be used as NPCs."
A Minecraft player with the nickname PALKIP tested the snapshot and shared the results of his creative experiment with the game community: he created a working "mirror."
In this case, the dummy plays the role of the player character's "reflection" — repeating his movements.
Due to this technical feature of the "mirror" implementation, you can notice that there is still a slight delay in the movement of the "reflection."