Is the wall made of the same material as the feeder?
No, the wall is made of concrete and the feeder is made of metal.
     src       edge_attr  dst
0      0  to the left of   16
1      0  to the left of   11
2      0  to the left of   20
3      0  to the left of   18
4      0  to the left of    8
..   ...             ...  ...
108   21  to the left of    8
109   21  to the left of   11
110   21  to the left of   20
111   21  to the left of   18
112   21  to the left of   19

[113 rows x 3 columns]