Perfect Sofa

Ultramodern Sofas 
Vladimir Kagan/Room and Board (TOP): A piece of designer sculpture for a manageable cost, Kagan's Hahn sofa channels pure mid-century mod. (91 inches, $1,699; roomandboard.com)

BoConcept (MIDDLE): The curvy, futuristic outline of the Alpha makes a serious design statement. Why it's practical: Leather is tough to stain. (98.5 inches, $3,999; boconcept.com)

Isamu Noguchi/Vitro (BOTTOM): Designed by Noguchi in 1946, this cream-colored Free Form Sofa echoes river rocks. Why it's practical: The cover is dry-cleanable. (118 inches, $9,145; dwr.com)