Assertion: piece | /r/HasProperty | different
Facets:
value: each time it is perfomed
type: TEMPORAL
Source sentences:
text: John Cage, for example, like Mozart, utilized randomness in many of his compositions, such as in Reunion, performed by playing chess on a photo-receptor equipped chessboard: "The players' moves trigger sounds, and thus the piece is different each time it is perfomed" (Alpern, 1995).