sentences:  As 23 Envelope, Oliver primarily art directed and designed, while Grierson primarily photographed (occasionally, however, duties would be exchanged and/or overlap).With Grierson's departure in 1988, Oliver saw fit to retire the 23 Envelope moniker, and continue working under the name v23 with new partner Chris Bigg, and various design associates that would come to include Paul McMenamin, Timothy O'Donnell, Martin Andersen and others.Meanwhile, Grierson focused more on the moving image, directing music videos and TV commercials, both in London and the USA.