To coincide with his most recent solo show at Siren Studios in Hollywood, Brooklyn-born actor and artist Gregory Siff has collaborated with Twelve Bar on an exclusive T-shirt. Continuing to blur the lines between pop art and abstract-expressionism, Siff has already gained a strong following among the local community in Hollywood. Building on the success of his recent projects, this latest showing is part of Siren Studios’ artist series platform, called the Rooftop Sessions. Offered in a white colorway, the shirt is adorned with a re-imagined Twelve Bar heart insignia featuring Siff’s unique “faces” artwork, alongside the phrase “There & Back” on the base of the rear neck. For those interested, the shirt will be sold exclusively at the event and through the Twelve Bar online store starting today, March 1, 2012. Meanwhile, check out the interesting time-lapse video of the artist below, working on a new body of work at Siren Studios, set to a soundtrack by James Brown.