But the real question is when the copy of Hawkins of 1983 ends up there, or why.
My guess is its All those kooky experiments taking place, I saw it as a Dumping ground for 11 and Co to send/force their negative feelings/actions to unaware of their consequences..
11 just went one step further and forced Henry into it..
And..
I haven't seen it mentioned but in the main Recreational area in the facility....
Those "Rainbows on the Walls"change from Right-side Up to Upside-down... leading me to think the good Doc was perhaps actually working at some point in the upside-down?