What is the mirror mounted to?
The mirror is mounted to the pole.
    src        edge_attr  dst
0     0  to the right of   11
1     0   to the left of   10
2     1               in    2
3     1   to the left of   13
4     1   to the left of    2
..  ...              ...  ...
82   14   to the left of   12
83   15       mounted to   12
84   15  to the right of   11
85   15               on   12
86   16               on   12

[87 rows x 3 columns]