What are the cables on?
The cables are on the ceiling.
    src        edge_attr  dst
0     1  to the right of   12
1     1               on    0
2     1   to the left of   14
3     2   to the left of    5
4     2   to the left of    9
..  ...              ...  ...
85   14  to the right of    1
86   14  to the right of   13
87   15   to the left of   12
88   15   to the left of    2
89   15   to the left of    7

[90 rows x 3 columns]