What do you think is on the wall?
The pipe is on the wall.
     src        edge_attr  dst
0      0   to the left of   26
1      0   to the left of   25
2      0   to the left of    9
3      0   to the left of   13
4      0   to the left of   12
..   ...              ...  ...
119   31  to the right of   18
120   32  to the right of   18
121   32  to the right of    8
122   32  to the right of   23
123   32  to the right of   19

[124 rows x 3 columns]