"[I]n "Helgoland" Rovelli explains his "relational" interpretation, in which an electron, say, has properties only when it interacts... When it is not interacting, the electron is devoid of physical properties: no position... velocity... trajectory. ...[T]he electron's properties are real only for the object it's interacting with and not for other objects. ...Rovelli's lyricism may depend on how many other ...accounts of quantum physics one may have read: The more that number, the more "Helgoland" will seem a poem."