There's no way to know exactly why, but Quinn has gone from daily problems at school to daily successes at school. We are trying a lot of things to help him succeed - daily joint compressions, daily skin brushing, a weighted vest and good 'ole bribery. So I don't know if one thing is key, or it's the combination. But I do know that the magic cushion is a major factor in his success.
A fellow adoptive mom who herself has sensory processing disorder gave his to us when she saw how much Quinn was struggling at Chinese school. He just could not sit in his chair and was really getting in other kid's personal space. It's a bean-filled plastic disc with a thick fleeecy cover. We take it to his special-needs preschool, his typical preschool and his weekly Chinese school.
I didn't realize how much it helped until I noticed that every day when I dropped him off the teachers would ask hopefully, "Do you have his cushion?"
Here's a link to the cushion itself. The cover, which has a velcro closure, was handmade - and all of his therapists covet it, so if you've seen them for sale anywhere, please let me know!