They are experiments by the CIA, and probably other secret services, testing their sound weaponry. The pattern are produced by sound waves which can now be focused in a very precise manner. As the technology improves the patterns can become more and more complicated.
Note that 2 years ago when the MSC Sinfonia was attacked by pirates on her way from South Africa to Italy, the pirates were defeated, and a sound gun was a contributing factor to hat.
The technology also allows to send a voice message targeted at a single dancer on a disco dance floor, irrespective of surrounding noise and music.