Hi...may I ask was the floor a checker board pattern...if it was, then yes I had a problem but didn't have a 3D issue....it was more of a distorted spacial issue. We do have peripheral vision issues as well as depth perception and these patterns do not help!
Add to that florescent lights which always made me nauseated.....
I do recall a curtain on a stage in Jr High doing the same thing u mention...if I looked at it directly it was a patterned curtain, but if I focused on a person on stage the pattern took on this different effect...very odd.
Walk into a darkened room and u lose balance too....so lights and patterns can and will affect those with chiari.
"selma"
I posted this once before but it has happened again. Very frustrating. There are some new people here so thought I would ask again. Thank you for your time