The Athenaeum of Philadelphia is the repository of working drawings by the great 19th-century architect Frank Furness (pronounced "furnace").

Currently it has something more whimsical on exhibition. Bulging eyes. Prolonged noses. Mouths twisted in grotesque grimaces.

"He had a great way of looking at your face and finding the couple distinctive features about your cheeks, forehead, or nose, and stretching them to the point where you are recognizable but making you look — frankly — ghastly," said Michael Lewis, a professor of art history at Williams College.

Lewis curated "Face and Form: The Art and Caricature of Frank Furness," a selection of drawings from Furness' personal sketchbooks, most of which are privately held by his descendants and have never been seen publicly.

Throughout his long career as an architect, Furness constantly drew funny faces for his own amusement, often at the expense of friends, clients, and relatives who were the subjects of the drawings. The quick but deftly accomplished illustrations hang beside examples of his architectural work to show that an exaggerated chin and comically sloped forehead are echoed in the bold, expressive elements of his buildings.

"He was well on his way to being a leading figure in architecture, but something happened around the Centennial exhibit in Philadelphia, in 1876," said Lewis. "American architecture began to turn cautious. Furness' unchecked individualism began to seem vulgar and rude. He was always respected as a great creative artist, but, 'children: don't do this at home.'"

In the late 19th century, Philadelphia was full to bursting with Furness buildings. One of the few still remaining is the Pennsylvania Academy of the Fine Arts.

"What you're looking at is industrial architecture," said George Thomas, an architectural historian and author, standing beneath the rafters of the 1876 building on Broad Street. Furness used exposed steel girders in the exhibition hall and a roof on hinges that could flap open, releasing heat. All are markers of an iron works factory, not a fine art museum.

"The magic of these buildings is that big sheets of glass are held up with steel armature — these metal stays holding these trusses together," said Thomas. "That is what Frank Furness and the engineers figured out."

Forging a modern identity for Philadelphia

At a symposium this weekend at the Athenaeum ("Frank Furness: His City, His World"), Thomas will hypothesize that Furness' engineering bravado caused him to be snubbed in important architectural circles of New York and Boston, but loved in Philly.

The heads of major organizations in most Eastern cities were usually bankers, and they wanted buildings that reflected their old-money tastes. On the other hand, Philadelphia was the workshop to the world. The heads of its civic organizations — the ones commissioning buildings — were people such as mechanical engineer William Sellers (president of the Franklin Institute), civil engineer Fairman Rogers (one of the founders of the Union League), and Dr. William Pepper (physician and founder of the Free Library of Philadelphia).

They hired Furness to design buildings for their businesses, their foundations, and their families.

"Philadelphia was run by engineers," said Thomas. "All the leading institutions — including PAFA — had as their principal board members the scientists and industrial engineers who were creating the modern world. They aren't afraid of this new stuff. Furness gave them an identity."

Furness is said to have designed 1,000 buildings during his career. Few remain today. Many of his buildings in Philadelphia were demolished in the 1950s, before his proto-modernist style came back into fashion. Now, several Furness buildings in the region are in various states of conservation.