Habitat Theory
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Jay Appleton proposed a habitat theory of landscape
aesthetics in The Experience of Landscape. His concept is that the
evolutionary heritage of man shaped our appreciation of certain landscape
characteristics above others. Appleton suggested that natural symbols that
suggest an abundant and benevolent habitat were selected over others.
Studies of birds that select territory based on the presence of certain
species of plants support his view. Indicator species of plants were used
to suggest future food abundance.
Similarly, the use of ornamental plants in human landscape may be
regarded as natural symbols suggesting an abundant habitat. You may wonder
why ornamental plants rather that food producing plants are the most
common plants near human habitations. The explanation may be that food producing
species attract animals and insects that threaten the comfort of the
place.
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Prospect |
Other natural symbols of a positive or supportive landscape are places
of prospect and refuge, according to Appleton. Places of prospect are
those from which one can view the landscape. Presumably, being able to see
animals or other people before they could see you was a desirable
evolutionary situation. Of course, being on a summit or plateau edge
overlooking a valley is a prospect situation but so are more subtle
situations such as viewing well lighted objects.
The the drawings in this page are from Motloch,
Introduction to Landscape Architecture
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Lack of Refuge
Refuge
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Conversely, man seems to prefer environments in which he can remain
unseen by others. These are refuge places. They are on the edge of open
spaces or enclosed spaces or, more subtly, places that are shaded rather
than in full sun.
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Prospect and Refuge
Describe a situation in which prospect and refuge symbols
are combined in a single place.
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The optimum circumstance is a place where one has a commanding view of
the landscape but can not be seen by others. |
Hazard
Discuss this image to illustrate Jay Appleton's Habitat
Theory of landscape aesthetics?
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A final aspect to habitat theory is the concept of hazard. Man prefers
stimulation and some level of risk in the environment. Venturing into the
unknown can have a positive evolutionary impact. It can provide
information that might prove vital to survival at a later time. This
behavior might be explained by the study of animals who make short and
then longer forays from their burrows. They gain information about
alternate escape routes that could save their lives in the future.
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Architecture and the Formation of Exterior Space
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Introduction
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Buildings may be regarded as sculptural objects but
simultaneously each facade is a spatial edge. This pages explores
the use of architecture to define exterior space.
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Degree of Enclosure
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Whether buildings or landscape elements define a space the
degree of enclosure is important to the character of the space. |
Minimal
Enclosure
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Vertical closure of the sight line is important in defining
space. The height of the vertical plane and its distance from the
view are important in establishing the degree of enclosure. If the
distance to height ratio is 4 to 1 or greater, then there is no sense of
enclosure. The vertical edge is simply perceived as a detail in a
larger landscape. At a 3:1 ratio a sense of minimal enclosure is
perceived, although the edge of the space is clearly defined.
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Partial Enclosure
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Of course, the vertical plane must be taller than a person
if the sense of enclosure is to be very effective, especially if the
privacy or blocking objectionable views is the design goal. Vertical
planes below eye level subdivide larger spaces.
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Full Enclosure
In which situation would a space feel unenclosed,
partially enclosed and fully enclosed? Express your answer in
terms of horizontal to vertical ratio. |
When the horizontal and vertical dimensions are equal a
sense of full enclosure is imparted. |
Describe a situation in which two facades of a single
building might be designed to express very different characteristics
(materials, color, stylistic elements).
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Buildings are often regarded as sculptural objects,
especially by the designer and owner. In this view, the character of
each facade is subservient to the sculptural idea. However, in an
urban context buildings often form the vertical edge of at least two
spaces. This view of a building suggests that the space and the
character of the facing buildings should influence the character of each
facade.
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When buildings enclose space, the arrangement, height and
proximity determine the sense of enclosure that they impart to the
user. In this image, the top diagram illustrates building edges that
incompletely enclose exterior space because the space leaks out of large
gaps between them.
While there are gaps between the buildings in the lower diagram, a more
clearly defined volume exists. However, from some locations within
the volume, one would sense a lack of enclosure due to the lack of a
vertical edge on the left.
The vertical edge can be pierced or implied to enclose a space to a
certain degree while giving visual or physical access to another space.
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Define what architectural use of plants means.
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When there are gaps between buildings, plants or garden walls
can link the architectural elements to form the spatial volume.
Notice that in this image that the buildings are too small and poorly
arranged to enclose space well. The addition of plant arranged as
architectural elements establishes major, alcove and circulation spaces.
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Plants can be treated as sculptural elements or masses just
as buildings can. They are used architecturally when their purpose is
to define spatial edges and establish a volume.
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Degree of Enclosure
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Enlarge and study this diagram. It illustrates the
degree of enclosure established by several arrangements of
buildings. Note that the location of buildings also imparts a
directionality to the spaces. Long narrow spaces establish this
sense of direction most strongly.
Notice that whether or not the sight line is terminated at a building
impacts the degree of enclosure, especially when approaching the space.
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Axial Exits
Blocked Sight Lines
Draw a plan view diagram of a whirling square.
Describe its attributes.
Whirling Square
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In the top plan and perspective, the buildings form an
almost completely enclosed space. However, because the entrances and
exits of the space are aligned the sightlines extend through the space to
terminate in the landscape outside the space. This diminishes the
importance of the space and its sense of enclosure from the
entrances. It emphasizes the circulation route through the space and
the
larger landscape.
In this diagram, the sight line from every entrance to the space is
terminated at a building. Therefore, the space seems completely
enclosed as one enters. This type of space is often called a
whirling square because of its pinwheel pattern.
The facade of the buildings are of great importance since they are
experienced frontally rather than from an oblique point of view.
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Variations
in the facade or the arrangement of the buildings can deliberately create
subspaces within the larger space. This is the beginning of the
development of a complex hierarchy of spaces that can serve a variety of
purposes.
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Because of the complete enclosure of this volume, the
orientation of the user is inward. The building facades dominate the
space and determine its character.
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Since space is only partially enclosed by this complex of
buildings, the orientation is outward from many locations within the
volume. The elements in the more distant landscape can influence the
space and the direction of circulation.
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Which type of space most strongly expresses directionality?
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A series of spaces can be developed by the careful design of
building shape. These can be characterized as arrival, directional
or alcove spaces. Notice the alternation of expansion and
compression of the volume. It induces pooling activity or
circulation.
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Draw four buildings in plan view. Shape them to define and
enclose two major spaces, two secondary or alcove spaces and one
directional space.
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This diagram illustrates a dynamic interplay between mass
and space.
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Form Making
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The design of site elements is to serve the use of people. Users seek
evidence of rational order or meaning in the design of landscapes and
buildings. The absence of a discernible idea or ordering system is often
regarded as unharmonious or ugly. To impart a discernible purpose and
order to a design geometry and proportioning systems are often adopted to
generate physical forms.
Geometry is a powerful generator of physical form. Rectangular, angular
and circular geometry singly or in combination are used by designers to
organize the designed environment.
Rectangular geometry is common to architecture due to construction
economy. However, the vertical and horizontal lines of the two and three
dimensional elements are resolved according to laws of gravity. The
vertical and horizontal lines are stable not dynamic. A great deal of
unity is imparted to the composition which can become predictable and
monotonous.
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The web site illustrates a method of generating an angular composition
of lines and edges that imparts a sense of rational order on the
composition. What is the method?
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Angular geometry depends on points, radial lines and angles to
establish a more complex and dynamic composition. The source of the
angular lines can be arbitrary and result in a confusing composition. A
method of controlling the angular composition is to generate all lines and
edges from one or more points within or outside of the composition. This
imparts a sense of rational order on the composition.
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What are the three components of circular
geometry?
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Circular geometry is based on lines revolving around points. The
generating point, the arc and radial forces confer a rational order to the
composition especially when a series of elements share some of these
fundamentals of geometry. |
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Often different geometric forms are combine to create
tension and dynamic designs. |