What is on the wall?
The pipes are on the wall.
     src        edge_attr  dst
0      0  to the right of   45
1      0  to the right of   19
2      0  to the right of    4
3      0  to the right of   11
4      0  to the right of   26
..   ...              ...  ...
321   46  to the right of    2
322   46  to the right of   10
323   46   to the left of   20
324   46  to the right of   29
325   46   to the left of   39

[326 rows x 3 columns]