Readers who have not read the explanatory leading article (see Nature 389, 213; 1997) may have been bemused by the appearance over the past five weeks, and the disappearance this week, of the series under the above title by Cornelia Parker. That series was commissioned in collaboration with the Ruskin School of Art and Design at Oxford University and sponsored by Southern Arts and the Arts Council of England. A new series of articles on art and science begins this week on page 799.