What is the color of the ground?
The ground is brown.
    src        edge_attr  dst
0     1  to the right of   29
1     1   to the left of   28
2     1               on   20
3     1  to the right of   27
4     1   to the left of   14
..  ...              ...  ...
58   27   to the left of    1
59   28  to the right of    1
60   29   to the left of    1
61   29   to the left of   23
62   29   to the left of    8

[63 rows x 3 columns]