As an autism mom, I'm grateful for the spinny chairs we got from ikea (IKEA PS LÖMSK).We originally got one for Garrett for Christmas last year. When my parents were here they saw how much all my kids liked that chair, so they gave them another one from "Grandpa Claus." :)
There is a quote in my now-favorite book about autism, The Reason I Jump: The Inner Voice of a Thirteen-Year-Old Boy With Autism, by Naoki Higashida. It talks about why people with autism like to spin:
"Everyday scenery doesn't rotate, so things that do spin simply fascinate us. Just watching spinning things fills us with a sort of everlasting bliss-for the time we sit watching them, they rotate with perfect regularity. Whatever object we spin, this is always true. Unchanging things are comforting, and there's something beautiful about that."