What is the tree on?
The tree is on the pitcher.
    src        edge_attr  dst
0     0        on top of    8
1     1  to the right of    4
2     2  on the front of    5
3     2               on    5
4     3   to the left of    4
5     4  to the right of   12
6     4   to the left of    1
7     4  to the right of    3
8     6        on top of    8
9     7        on top of    8
10   11        on top of    8
11   12   to the left of    4