I've been thinking of it as a bubble. But a not like a soap bubble. A bubble of tough material, like a shell, that has the capacity to harden, but is flexible only to an extent.
The bubble warps the view of it's inhabitant, and also warps the view of people outside the bubble.
This is why the Autistic has a view of the world nobody else can see or understand. What they see from the outside isn't an accurate representation of what's really inside. What the inhabitant sees isn't an accurate representation of what lies outside. As the two describe what they see to each other, neither description makes sense to the other, because the description doesn't match what they think they are seeing.
Also, when "outsiders" try to influence the bubble's inhabitant, that influence is viewed as a threat, because the method of influence is based on what the outsider thinks they are seeing, which of course doesn't match what the inhabitant knows is there. When the inhabitant feels threatened, the bubble is hardened, and becomes less flexible, sometimes to the point of becoming rigid, and even changes from being see through to totally opaque. Outsiders mistakenly view this as "stubbornness," when what it really is, is self defense.
The clam analogy works to some extent though. A clam is normally open just enough to allow sea water to flow through its stomach, capturing tiny organisms for food. The "outsiders" above can be viewed as starfish. Starfish feed on shellfish by clamping down on their shells, forcing them to open, and sucking out their insides (pretty picture, huh?). When a clam is threatened by a starfish, it clamps shut suddenly, pulling itself closed tighter and tighter the harder the starfish tries to get it open.
I think of a lot of educational professionals as starfish. They sometimes unknowingly cause Autistic children to feel threatened, and become frustrated when the child "clams up." Most of them seem to react to the phenomenon the same way, by trying harder to get the child to open up, applying more pressure, not realizing that by doing so they are causing the child to clam up even tighter.
The hardest thing to convince these starfish to do is NOTHING. Stop putting pressure on the poor kid! Leave him alone, and he's open up when he's ready! When he no longer feels threatened. Take a lesson from nature! The clam, once all the starfish are gone for a while, opens right back up and continues on normally, as if nothing had happened.
The concept of leaving the kid alone, and letting him come around when he's ready is totally foreign to almost everyone in the educational field. Their job is to TEACH kids, and they can't teach a kid who won't open up. It is SO hard to convince them to just back off and quit doing what they do.
The few that do bother to actually try it are amazed, if they are patient enough to try it long enough. "My god! it works!" they say.
Too bad many of them (as few as they are) seem to have bad memories. In my experience, quite a lot of those that do bother trying this, and seeing that it works, forget by the next time it happens, and go right back to driving the kid deeper into his shell.
Then, we get the inevitable phone call.
"He's doing it again! Any suggestions?"
"Uh. Yeah, dingbat! Same thing I told you last time! KNOCK OFF WHAT YOU'RE DOING AND LEAVE HIM ALONE!"
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...