Is the ground black?
Yes, the ground is black.
    src        edge_attr  dst
0     0  to the right of    2
1     1   to the left of   12
2     2   to the left of   13
3     2   to the left of    0
4     2   to the left of   10
5     2   to the left of    6
6     2   to the left of    7
7     2  to the right of    9
8     2   to the left of   11
9     2  to the right of    4
10    4   to the left of    2
11    5   to the left of   10
12    5   to the left of   11
13    5   to the left of   12
14    5   to the left of    7
15    6  to the right of    2
16    7  to the right of    5
17    7  to the right of    2
18    9   to the left of    2
19   10  to the right of   13
20   10  to the right of    5
21   10  to the right of    2
22   11  to the right of    5
23   11               on   10
24   11  to the right of    2
25   12  to the right of    1
26   12  to the right of    5
27   13  to the right of    2
28   13   to the left of   10