This unique phenomenon can be easily reproduced in a pool on a sunny day. If you liked this video check out these: How to Make a SQUARE Vortex Ring! https://www.youtube.com/watch?v=N7d_RWyOv20 Why Hawaii's volcano is so UNUSUAL https://www.youtube.com/watch?v=k0tnqPmwWvk Subscribe - http://www.youtube.com/subscription_center?add_user=physicswoman http://instagram.com/thephysicsgirl http://www.p