There was an interesting article online today about a black/white rug that made people feel seasick after looking at it and some research done on it. It says certain repeating patterns in high contrast can really affect some people.
I've seen a post or two on the QB about someone feeling ill or dizzy while working on a quilt. I know sometimes I've felt a bit dizzy when studying quilts done in just two color with high contrast and repeating blocks.
Have you ever made a quilt with a pattern that made you feel sick? What was the pattern? Did you finish making it?