What is the color of the ground?
The ground is gray.
    src        edge_attr  dst
0     1   to the left of    9
1     1   to the left of    8
2     1   to the left of   10
3     2  to the right of   19
4     2  to the right of    4
..  ...              ...  ...
74   23   to the left of   21
75   24  to the right of   17
76   24  to the right of   13
77   24  to the right of   12
78   24  to the right of    6

[79 rows x 3 columns]