What is the marker on?
The marker is on the desk.
    src        edge_attr  dst
0     0  to the right of   14
1     0  to the right of   13
2     0  to the right of   18
3     0  to the right of    2
4     0  to the right of   12
..  ...              ...  ...
81   22  to the right of    9
82   22   to the left of    4
83   22   to the left of    5
84   23   to the left of    0
85   23   to the left of    8

[86 rows x 3 columns]