From Julie, Janet & Sarah: The only certainties in life may be death and taxes; but add to that the need for a perfect white sofa. Here are ten that will fulfill your existential needs.

Above: Ghost 4-seat Sofa by Italian designer Paola Navone for Gervasoni, 86 inches long; $2,240 (down from $2,800) at Conran USA. See the Ghost sofa in situ in House Call: Arent & Pyke in Australia.

Above: Jasper 86-inch Sofa; $1,399 at Room and Board.

Above: Karlstad Sofa with 100 percent cotton slipcover; $499 at Ikea.

Above: John Derian Cove Sofa by Cisco Brothers, makers of organic furniture, upholstered in Libeco linen; starts at $3,795 at Wildflower Home.

Above: Rue de Tournon Sofa from Catherine Memmi.

Above: Geoffrey from Montauk Sofa is 95 inches long; $3,800.

Above: Magnum by Flexform, 106 inches long; $4,610 at Europe by Net.

Above: Barcelona Slipcover Sofa, available in 72-, 84- and 96-inch lengths; $2,240 to $2,540 at Inside Avenue.

Above: Blu Dot Swept Sofa; $1,799 from Zinc Details.

Above: The 88-inch-long Movie Sofa from CB2 is $1,199.

Above: The investment piece: the perfectly proportioned, French-manufactured Renversant Canape Sofa; $6,800 before fabric (requires about 15 yards) for the 79-inch model. Also available in 87-inch size from Interieurs.

Above: Sofa perfection from Italian furniture maker De Padova Studio; Vico Magistretti's reinterpretation (and slimming down) of the classic English saddle-arm sofa. For information on the Raffles Sofa, go to Suite NY.