Toronto police are searching for a woman who stole a rock from a Yoko Ono exhibit at the Gardiner Museum on Friday, Global News reports. A spokesman for the department says that the rock, which has the words “Love yourself” written on it, has an appraised insurance value of $17,500 and was taken from the museum after 5:30PM. The suspect, last seen walking south of the museum, was caught on a security camera.

Female sought in Theft Over $5000 investigation. Mon. Mar. 12, at 5:35 p.m., at the Gardiner Museum located at 111 Queen’s Park. She allegedly stole a rock on display of an art exhibit. Last seen walking south on Queen’s Park. #GO601628 if seen pls call 416-808-5200 ^gl pic.twitter.com/uzoQ38AZ9S

— Toronto Police OPS (@TPSOperations) April 7, 2018

The Gardiner Museum is currently hosting a three-part interactive installation by Yoko Ono called The Riverbed. According to the museum’s website, one of those parts, Stone Piece, “features a pile of river stones that have been honed and shaped by water over time. Ono has inscribed some of the stones with words, such as dream, wish, and remember. Visitors are invited to pick up a stone and hold it, concentrating on the word, and then placing the stone upon the pile of other stones in the center of the room.”