Taylor Swift gave fans a behind-the-scenes look at her creative process while making the Fortnight music video, which she wrote, directed and starred in.On Friday, the pop star, 34, shared a nearly four-minute YouTube video containing unseen footage from her time on set working alongside collaborator Post Malone.

The recording begins with the Cruel Summer hitmaker throwing a metal cart at a two-way mirror in inside a mental institution with stark white walls.

Unlike in the official video, however, the cart ricochets back at her, instead of shattering the glass, like in the final cut.

After the cart falls to the floor, narrowly missing her face, the 14-time Grammy winner can be seen immediately bursting into laughter.

‘So we use the other one,’ she mused.

The billionaire, originally from West Reading, Pennsylvania, proceeds to explain that, in her mind, that the video is taking place in The Tortured Poets Department, which she describes as a ‘government municipal building where they study the behaviors and minds of poets.’

‘One of the stereotypical things about poets over the years is that the people said they were crazy,’ she explains, before watching a monitor of herself making an ‘unsettling’ face at the camera.

Later, she speaks about working with Post Malone and can be seen instructing him on how to use a typewriter.

For his scene, she explains to him that all he faces to do is type and when he says ‘look’ they both need to ‘look at each other.’

‘Almost like when you realize that you and the other person have the same thought in your head at the same time,’ Swift says.

‘Yes, ma’am,’ he tells her.

After he finishes, she pulls off her headphones and tells the rapper his performance was ‘stunning.’

‘The thing that I really love about being on set is sometimes you like figure out the shot two seconds before you do it and like it makes it all the difference.’

She then revealed that she was inspired to leave a clue for Swifties on a book, which had the word ‘Us’ scrawled on it in her handwriting.

It seems she was hinting to her collaborative track with Gracie Abrams, called Us, released on June 21.

The final moments of the video show cameras rolling as Swift running into Post Malone arms, before they look back together on the scene.

‘You went nuts!’ he exclaims, before she also tells him he did a great job.

She goes on to gush: ‘It’s amazing… I’m so excited!’

He then dubs her ‘one-take Tay.’

After the music video released in April, Taylor took to her main Instagram page to share a series of behind-the-scenes images.

She also shared a message to her fans about the meaning behind the music video and penned, ‘When I was writing the Fortnight music video, I wanted to show you the worlds I saw in my head that served as the backdrop for making this music.’

‘Pretty much everything in it is a metaphor or a reference to one corner of the album or another. For me, this video turned out to be the perfect visual representation of this record and the stories I tell in it.’

She gushed, ‘@postmalone blew me away on set as our tortured tragic hero and I’m so grateful to him for everything he put into this collaboration.’

‘I’m still laughing from getting to work with the coolest guys on earth, @ethanhawke and @mrjoshcharles (tortured poets, meet your colleagues from down the hall, the dead poets).’