The French restaurant "Le Petit Chef (Little Chef)" came up with an original way to entertain guests while waiting for their order by using an overhead projector on the ceiling. The animation appears on the table and your plate.
Each square represents 500,000 people.
From the World Economic Forum.
http://nautil.us/issue/32/space/beauty-is-physics-secret-weapon
Classical flashmobs:
http://www.washingtonsblog.com/2016/01/classical-flashmobs.html
Bach, reimagined:
http://www.washingtonsblog.com/2016/01/bach-reimagined.html