In February, Tiffany unveiled its collaboration with stylist/designer Rachel Zoe. Instead of a high-profile design partnership, Zoe was commissioned to decorate the windows of Tiffany’s 5th Avenue flagship in honor of the Oscars.It was a bold bit of theatrics; but in fact, Tiffany understands that visual merchandising is key to courting customers. Finding unique jewelry lines isn’t enough—the pieces must also be displayed in a way that invites browsing, conversation, and, finally, buying.“Less really is more,” says Michael Kowalski, vice president of merchandising for New York City�