In the eyes of the inhabitants of the Chinese city of Qingdao, just a few minutes increased building. As it turned out, it was only the optical illusion. It was the usual mirage, however, for these latitudes it unnatural. Phenomenon remained deserted until the next day.
According to meteorologists, it was not a mass hallucination. Object with white walls appeared on city streets because of optical processes. In the air reflected the adjacent building. Cause atmospheric phenomenon was warm, windless weather.