Life in a Day, the YouTube documentary which boasts Sir Ridley Scott as an executive producer, has gone on show for the first time - with the first teaser trailer released on the video site.

Teaser #1 shot by Toniu Xou and Patricia Marinez del Hoyoa, shows a young girl sporting a helmet cam and climbing a human castle in the small town of San Jaume dels Domenys in Tarragona, Spain.

It's one of 1,125 clips shown in the film, that were selected from a 80,000 submissions (comprising more than 4,500 hours of footage).

Life in a Day is described as an "historic cinematic experiment" and will have its première at the Sundance Film Festival on 27 January.

It will be simulcast on the web at the same time, 5pm PST.