Is the wall behind the tree that is behind the panda bear?
Yes, the wall is behind the tree.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of   14
2     1  to the right of   10
3     2           behind   13
4     2      in front of    6
5     2  to the right of    9
6     2   to the left of    5
7     2  to the right of   14
8     2  to the right of    0
9     2  to the right of   15
10    3   to the left of    5
11    5  to the right of    2
12    5             near   13
13    5          next to   13
14    5  to the right of   16
15    5  to the right of    7
16    5  to the right of    3
17    5  to the right of    9
18    6           behind    2
19    7   to the left of    5
20    8               on   13
21    9   to the left of    5
22    9   to the left of    2
23    9  to the right of   11
24   10  to the right of   11
25   10   to the left of    1
26   11   to the left of   10
27   11   to the left of    9
28   13               on   12
29   13       sitting on   12
30   13      in front of    2
31   13             near    5
32   14   to the left of    2
33   14  to the right of    0
34   15   to the left of   16
35   15   to the left of    2
36   16  to the right of   15
37   16   to the left of    5