What's the fence in front of?
The fence is in front of the tree.
    src        edge_attr  dst
0     0      surrounding   14
1     0           behind    2
2     0      in front of    8
3     0      in front of    9
4     1           behind    2
5     2      in front of    0
6     2   to the left of    4
7     2          wearing    3
8     2      in front of    1
9     2   to the left of    6
10    2          wearing    6
11    2   to the left of   16
12    2  to the right of    9
13    2   to the left of    8
14    2  to the right of    5
15    3   to the left of   13
16    3   to the left of   17
17    4  to the right of    2
18    5  to the right of    9
19    5   to the left of    2
20    5   to the left of    7
21    6  to the right of    2
22    7  to the right of    5
23    7  to the right of    9
24    8           behind    0
25    8  to the right of   11
26    8  to the right of    2
27    8  to the right of   13
28    9   to the left of    5
29    9   to the left of    7
30    9           behind    0
31    9   to the left of   11
32    9   to the left of    2
33   11  to the right of    9
34   11   to the left of    8
35   13   to the left of    8
36   13  to the right of    3
37   13   to the left of   16
38   13  to the right of   17
39   14    surrounded by    0
40   16  to the right of   13
41   16  to the right of    2
42   17               on   13
43   17  to the right of    3
44   17   to the left of   13