Brad Pitt is channeling his energy into sculpture.

The 53-year-old actor has been locking himself away in an art studio following his breakup with Angelina Jolie, an eyewitness tells ET.

WATCH: Angelina Jolie Got Matching Tattoo With Ex Brad Pitt Months Before Split: Pic

According to the eyewitness, Pitt has taken up sculpting as a hobby under the direction of his friend, British artist Thomas Houseago, spending up to 15 hours a day in the studio, until the early hours of the morning.

The father of six reportedly arrives in the late morning hours on a motorcycle, sporting a new look to go with his new hobby.

Earlier this month, Pitt arrived at the studio via motorcycle in skinny jeans and a yellow flannel.

WATCH: Brad Pitt Makes Surprise Golden Globes Appearance to Big Applause

The actor usually spends the day with Houseago and his team of assistants, but stays behind at night to work on his piece, says the eyewitness, who adds that Pitt often listens to sad songs, like mellow tunes by Bon Iver and the breakup song "Just to Satisfy You" by Waylon Jennings.

Just a few months ago, Pitt looked to be in great spirits while listening to the songs of another artist, Sting, at the Epidermolysis Bullosa Medical Research Foundation's fourth annual ROCK4EB! charity event.

See more in the video below.