This was really weird to stand in - I felt like I was falling over as they moved. Made me feel sick!
The most common cause of feeling a kind of vertigo, dizziness..., kaleidoscopic vision is a visual migraine. It is also known as ocular or ophthalmic migraine. The technical term is scintillating scotoma and occurs most often in both eyes.
About 25 percent to 30 percent of migraine sufferers have visual symptoms.
A visual migraine occurs when nerve endings in a portion of the back of the brain called the visual cortex are activated. The reason for this is unknown. On an MRI scan, it is possible to see that the activation spreads through the visual cortex as the migraine episode progresses.
Symptoms usually last no more than 30 minutes. You do not necessarily experience headache pain at the same time. A visual migraine without a headache is called an acetalgic migraine. Many years ago I suffered from that, specifically from stress.