<s>
In	O
computer	O
graphics	O
,	O
turtle	B-Application
graphics	I-Application
are	O
vector	O
graphics	O
using	O
a	O
relative	O
cursor	B-Application
(	O
the	O
"	O
turtle	O
"	O
)	O
upon	O
a	O
Cartesian	O
plane	O
(	O
x	O
and	O
y	O
axis	O
)	O
.	O
</s>
<s>
Turtle	B-Application
graphics	I-Application
is	O
a	O
key	O
feature	O
of	O
the	O
Logo	B-Device
programming	I-Device
language	I-Device
.	O
</s>
<s>
A	O
full	O
turtle	B-Application
graphics	I-Application
system	O
requires	O
control	O
flow	O
,	O
procedures	O
,	O
and	O
recursion	O
:	O
many	O
turtle	B-Application
drawing	I-Application
programs	O
fall	O
short	O
.	O
</s>
<s>
The	O
idea	O
of	O
turtle	B-Application
graphics	I-Application
,	O
for	O
example	O
is	O
useful	O
in	O
a	O
Lindenmayer	B-Language
system	I-Language
for	O
generating	O
fractals	B-Application
.	O
</s>
<s>
Turtle	B-Application
graphics	I-Application
are	O
often	O
associated	O
with	O
the	O
Logo	B-Device
programming	I-Device
language	I-Device
.	O
</s>
<s>
Seymour	O
Papert	O
added	O
support	O
for	O
turtle	B-Application
graphics	I-Application
to	O
Logo	B-Device
in	O
the	O
late	O
1960s	O
to	O
support	O
his	O
version	O
of	O
the	O
turtle	O
robot	O
,	O
a	O
simple	O
robot	O
controlled	O
from	O
the	O
user	O
's	O
workstation	O
that	O
is	O
designed	O
to	O
carry	O
out	O
the	O
drawing	O
functions	O
assigned	O
to	O
it	O
using	O
a	O
small	O
retractable	O
pen	O
set	O
into	O
or	O
attached	O
to	O
the	O
robot	O
's	O
body	O
.	O
</s>
<s>
Today	O
,	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
's	O
standard	O
library	O
includes	O
a	O
Turtle	B-Application
graphics	I-Application
module	O
.	O
</s>
<s>
Like	O
its	O
Logo	B-Device
predecessor	O
,	O
the	O
Python	B-Language
implementation	O
of	O
turtle	O
allows	O
programmers	O
to	O
control	O
one	O
or	O
more	O
turtles	O
in	O
a	O
two-dimensional	O
space	O
.	O
</s>
<s>
Since	O
the	O
standard	O
Python	B-Language
syntax	O
,	O
control	O
flow	O
,	O
and	O
data	O
structures	O
can	O
be	O
used	O
alongside	O
the	O
turtle	O
module	O
,	O
turtle	O
has	O
become	O
a	O
popular	O
way	O
for	O
programmers	O
learning	O
Python	B-Language
to	O
familiarize	O
themselves	O
with	O
the	O
basics	O
of	O
the	O
language	O
.	O
</s>
<s>
The	O
ideas	O
behind	O
turtle	B-Application
graphics	I-Application
can	O
be	O
extended	O
to	O
include	O
three-dimensional	O
space	O
.	O
</s>
<s>
Cheloniidae	O
Turtle	B-Application
Graphics	I-Application
is	O
a	O
3D	O
turtle	O
library	O
for	O
Java	B-Language
.	O
</s>
