The
Jean-Michel Frank sofa. You might not be familiar with the name, but you are familiar with the look. It is everywhere. It is classic and clean
and works with most modern (after 1930) interior design. If you own this
shape sofa, it will fit in almost anywhere, though it might not
follow the other lines in your furniture designs, it will not interfere,
stand out too much, or compete. It possesses straight sides; is not too puffy, and depending on the chosen upholstery, also not too
unusual.
Jean
Michel Frank [1895-1941] was born near the end of the 19th century. Consider
what furniture movements were around at that time and you can see how this
shape would have been considered highly unusual to some or extremely pedestrian to
others.

The proof
of this design as a classic style and the fact that it plays well with others is
that almost every major furniture retailer has a similar style in their core
collection, such as:
Room & Board: Dean,
runner ups: Essex, Winston
Crate and Barrel: Axis,
runner ups: Lombard, Cameron
Restoration Hardware: Austin
Pottery Barn: PB
Square
Macy's (as close as it gets) Corona
IKEA (close but not it) Karlstad
DWR: (close) Portula
For more
on Jean-Michel:
Jean
Michel Frank: The Strange and Subtle Luxury of the Parisian Haute-Monde in the
Art Deco Period,
by Pierre Emmanuel Martin-Vivier, $64
Architectural Digest Design Legends: Jean-Michel
Frank
Architonic: Products
Note: Jean-Michel never licensed his
designs. The only way someone can guarantee that they have one of his pieces is
if it can be documented that it was a part of an interiors he designed for a
client's home.