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nature with green. Blue symbolizes exhaust gases of vehicles that usually
come along with the emission of sound. The color yellow indicates
artificial or chemical production and serves as a visual equivalent for
sources connected to economy. Red associates people and matches sound
caused by human activities. In general, green is a symbol for nature and
adequately presents environmental sound sources.
Figure 2: Color hues envision (sub)categories of sources
5.3 Dominant Soundmark
We present nominal point symbols as possible candidate encodings for the
visualization of dominant soundmarks that can be pictorial, associative, or
geometric (Robinson et al. 1984). We provide a set of associative point
symbols for dominant soundmarks as they are nominally described discrete
phenomena ( Fig. 3 ). The auditory perception of dominant soundmarks and
the interpretation of their corresponding symbols are highly subjective and
context-sensitive so that our candidate solutions serve as sketches.
Figure 3: Associative nominal point symbols present dominant soundmarks
 
 
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