Sand Castle Tapes is a documentary and live concert filmed by Heleen Declercq. It captures Balthazar's stay at a beautiful old (possibly haunted) castle near Brussels. The band came together for the first time after lockdown to interpret the new songs and play for friends. Declercq's inquisitive eye captures the magical atmosphere and reveals an intimate look at Balthazar as their music and story unfolds within the ancient castle walls.