Louis Sullivan was an influential American architect known for pioneering skyscraper design and the philosophy of "form follows function." Some key aspects of his work included using plain geometric shapes and naturalistic ornamentation. He employed steel structures to build tall buildings and often incorporated massive semi-circular arches in his designs. Two of his most notable buildings were the Auditorium Building in Chicago, which featured the first central air conditioning system and electric lighting, and the Guaranty Building, which demonstrated his U-shaped floor plans and use of terra cotta ornamentation.

2. INTRODUCTION
 Louis H. Sullivan (1856-1924)
was one of the most influential
architects to come out of the
Chicago School of architecture in
the late 1800s.
 He is often called the father of
the skyscraper or the prophet
of modern architecture .
 Louis Sullivan’s architecture is a
mixture of
1. plain geometry
2. undisguised massing
punctuated with elaborate
pockets of ornamentation in
stone, wood and terra cotta.

3. For follow fu ctio -louis
sullivan
 Form follows function -
The principle is that the
shape of a building or
object should be primarily
based upon its intended
function or purpose.
 Functionalism of the
building was the main
important criteria for louis
sullivan in their building.
 He takes simple geometric
forms which makes it
distinctive style of
ornament that embraced
natural forms.

5. ORGANIC SYMBOLS WERE USED
FOR CREATING ORNAMENTATION

6. STEEL STUCTURES
 The mass production of steel was the
main driving force behind the ability to
build skyscrapers during the mid-
1880s.
 The development of cheap, versatile
steel in the second half of the 19th
century changed rules.
 The taller the building, the more strain
this placed on the lower sections of the
building; since there were clear
engineering limits to the weight such
"load-bearing" walls could sustain,
large designs meant massively thick
walls on the ground floors, and
definite limits on the building's height.
 A much more urbanized society was
forming and the society called out for
new, larger buildings.

7. SEMI-CIRCULAR ARCH
 Another signature
element of Sullivan's
work is the massive,
semi-circular arch.
 Sullivan employed such
arches throughout his
career—in shaping
entrances, in framing
windows, or as interior
design.

8.  Year(s) of construction: 1895-
1896
 Architects: Louis H. Sullivan and
DankmarAdler
 Function: Office Building
 Present name: Prudential
Building
 No. of Floors:13
 Height:46 m
GURRANTY BUILDING

9. PLANS
The building is essentially a U-shaped plan stacked upon a rectangular solid. The interstitial
spaces between wings of the U create opportunities to introduce skylights to the lobby
below, and to cover the ceilings with stained glass. The plan contained a single vertical
circulation core with four elevators, a mail slot, and staircase. No fire-stair was provided or
necessary. The internal portion of the U faces south so as to collect light for the interior
recesses of the building- light being a necessary commodity to attract good tenants

10. Sections and elevation

11.  The structure was built
entirely of steel
 Combines masonry with
terra cotta
 Ornaments :most
defining characteristics
 used strong vertical lines
to emphasize their
verticality

12. INTERIOR

13. AUDITORIUM BUILDING
 Location: 430 S.
Michigan Avenue
Chicago Illinois 60605
United States
 Built: 1889
 Architect:Louis sullivan
 Architectural style: Late
19th and Early 20th
Century American
Movements

14.  The Auditorium
Building in Chicago is one
of the best-known designs
of louis Sullivan.
 It was added to the National
Register of Historic
Places on April 17, 1970. It
was declared a National
Historic Landmark in
1975, and was designated
a Chicago Landmark on
September 15, 1976.
 auditorium was designed so
that all seats would have
good views and acoustics
 No. of Floors:13
 Height:46 m

15. Sectional view of the building

16. features
 The building was equipped with the
first central air conditioning system &
 the theater was the first to be entirely lit
by incandescent light bulbs
 The theatre, created to hold up to 4,200
audience members.
 The raft foundation distributes the
weight of the massive outer walls over a
large area
 Ceiling is constructed in such a way that it
doesn’t reflect large amount of incident
sound energy; but absorbs