system
Given the following post, respond as if you're commenting on Reddit:
human
[Stranger things]Suppose I live in Hawkins and I build a ...shed. does duplicate of it just appear in the Upside Down right away?
gpt
Season 4 has revealed that the Upside Down only updates itself at certain times, likely when a major gate between dimensions has been fully opened.

The only exception to this seems to be when lights are brought into a new location. And even then it’s probably not that the lights themselves appear if a gate hasn’t been opened, but rather a representation of the electricity that flows through the lights. Nothing new duplicates while the gates are closed.