What is the moss on?
The moss is on the rock.
     src        edge_attr  dst
0      0   to the left of   14
1      0  to the right of    9
2      0   to the left of   19
3      1               on    5
4      2   to the left of   22
..   ...              ...  ...
113   22  to the right of   10
114   22  to the right of    8
115   22  to the right of    9
116   22  to the right of   18
117   22  to the right of   16

[118 rows x 3 columns]