This illusion invented Japanese psychiatrist Akioshi Kitaoka.

This illusion invented Japanese psychiatrist Akioshi Kitaoka. He argues that the illusion is fixed for a calm, balanced and relaxed people. If the illusion is actively moving, you need to rest and sleep for 8 hours. Well, if the illusion is very fast moving, then you urgently need ... rest in the hospital, you are shorter end.
So, check yourself, and if that - go have a rest!