<s>
Alluvial	B-Application
diagrams	I-Application
are	O
a	O
type	O
of	O
flow	B-Application
diagram	I-Application
originally	O
developed	O
to	O
represent	O
changes	O
in	O
network	O
structure	O
over	O
time	O
.	O
</s>
<s>
In	O
an	O
alluvial	B-Application
diagram	I-Application
,	O
blocks	O
represent	O
clusters	O
of	O
nodes	O
,	O
and	O
stream	O
fields	O
between	O
the	O
blocks	O
represent	O
changes	O
in	O
the	O
composition	O
of	O
these	O
clusters	O
over	O
time	O
.	O
</s>
<s>
Alluvial	B-Application
diagrams	I-Application
were	O
originally	O
developed	O
to	O
visualize	O
structural	O
change	O
in	O
large	O
complex	O
networks	O
.	O
</s>
<s>
Alluvial	B-Application
diagrams	I-Application
highlight	O
important	O
structural	O
changes	O
that	O
can	O
be	O
further	O
emphasized	O
by	O
color	O
,	O
and	O
make	O
identification	O
of	O
major	O
transitions	O
easy	O
.	O
</s>
<s>
Alluvial	B-Application
diagrams	I-Application
can	O
also	O
be	O
used	O
to	O
illustrate	O
patterns	O
of	O
flow	O
on	O
a	O
fixed	O
network	O
over	O
time	O
.	O
</s>
<s>
The	O
Users	O
Flow	O
feature	O
of	O
Google	O
Analytics	O
uses	O
alluvial	B-Application
diagrams	I-Application
to	O
graphically	O
represent	O
how	O
visitors	O
move	O
among	O
the	O
nodes	O
(	O
individual	O
pages	O
)	O
on	O
a	O
website	O
.	O
</s>
