Your eyes can often fool you into seeing things that normally wouldn't take place, just like this water illusion by artist Brusspup.
This amazingly twisted water effect is produced by applying vibrations from a speaker to a hose, in order to create the swirling effect seen in the video. When different levels of sound are applied to the speaker, it serves to produce an array of various swirls and patterns.
One never would have guessed that the swirling water effect could only be visible through the lens of a camera, and according to the artist, that's the only way to visually see this optical illusion. Brusspup also provides some handy instructions on how you can achieve this surreal effect yourself.