Toronto police are looking for a museum visitor who allegedly stole a pricey stone from a Yoko Ono exhibition.

“Yoko Ono: The Riverbed,” currently on view at the Gardiner Museum in Toronto, invites visitors to hold, meditate, and stack stones, some of which the artist has inscribed with phrases like, “dream,” “wish,” and “remember.” But one visitor took the interactive exhibition too far when she walked out of the museum with a stone reading “Love Yourself” on March 12. While the phrase itself is extremely common––gracing the advertisements of countless body wash campaigns and titling the hit song by Justin Bieber––this stone is not. The object, which Yoko hand-painted, is estimated to be worth $17,500. The Toronto police are now searching for the alleged thief, according to the Toronto Star, which first reported the stone’s disappearance. The police have released security footage of the suspect and are seeking help in identifying the 55-60 year old woman who was caught on camera in a black ensemble with a red scarf.