Thursday is national happy day, and in celebration Pharrell Williams debuted the video for his single, “Happy,” that is 24 hours long.

The music video is available for anyone to watch on 24hoursofhappy.com, it features various dancers lip-synching to “Happy” throughout the  course of the day in L.A. The song is played on loop, with a new dancer or dancers at a different location at each cycle. People who are watching the video can fast-forward for go backwards using a clock interface that hovers over the display. Viewers are also able to share specific moments at any time on Twitter or Facebook.

Sophomore Esther Serwadda said she was intrigued by the video because she is a big fan of the song, “The beginning was really good but after about ten minutes of it, it got really repetitive.” Serwadda said.