What is the picture showing?
It is showing a pen.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of   11
2     1  to the right of    3
3     2  to the right of    8
4     2  to the right of    3
5     3   to the left of    1
6     3   to the left of   11
7     3   to the left of    2
8     3   to the left of   13
9     4   to the left of   13
10    4  to the right of   12
11    4  to the right of    6
12    5   to the left of   13
13    6   to the left of    4
14    7   to the left of   10
15    8   to the left of   11
16    8   to the left of    2
17    8   to the left of   13
18    9  to the right of   12
19   10  to the right of    7
20   11  to the right of    0
21   11  to the right of    3
22   11  to the right of    8
23   12   to the left of    9
24   12   to the left of    4
25   13  to the right of    5
26   13  to the right of    0
27   13  to the right of    4
28   13  to the right of    3
29   13  to the right of    8