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