I need more information.
I had boxes when I was a kid. First the box my grandparents' new refrigerator came in-- when I was still so small Grandma had to give me a chair to climb up and jump in or lift me in and out. Then my Dad bought himself a 36-inch CRT television. I kept the box for YEARS-- until I decided being a teenager meant I was too big to curl up in a cardboard box. I cried when I let it go. The TV has long since gone the way-- but I'm 34 years old and I still think of the box.
It was never some place I was ordered to go-- always a matter of choice-- but I LOVED my boxes. Used to fantasize about taking them to school with me. WISH I could have them to crawl into when things got bad.
How big a box?? Where is the box?? Does the child like the box?? Did the child ask for the box?? Is the child being stuffed into the box, or does the child go willingly??
We can't afford to be reactionary. This could be a good thing, or a very bad thing.
As for being exposed to ridicule-- KIDS need to be exposed to people with obviously different needs. It's the only f*****g way they're ever going to learn to see those things and NOT MAKE FUN. Living with difference every day is the only way people are ever going to learn that DIFFERENCE DOES NOT EQUAL DEFICIT. As long as they're shielded from it, it's going to be viewed as something they need to be protected from, something that is not to be seen, that is therefore bad.
They ABSOLUTELY should have been working WITH the parent(s) on this, though. That should totally NOT have come as a surprise.
Aspies aren't the only ones with a lot of learning to do. There's plenty of stuff the NT world needs to learn to change too.
Like not flipping out when a kid rocks. Or cries too loudly or too easily. Or sucks their thumb.
Or crawls into a box.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"