Which color is the sky above the wires?
The sky is gray.
    src        edge_attr  dst
0     0           behind    7
1     0            below   14
2     1   to the left of   11
3     1  to the right of    5
4     2  to the right of    7
5     3   to the left of   11
6     5          beneath    7
7     5   to the left of    1
8     5   to the left of   11
9     5            below   14
10    5            above   10
11    7   to the left of    2
12    7      in front of    0
13    7            above    5
14    7      in front of   12
15    7            above   10
16    7            below   14
17    8           behind    9
18    9           behind   10
19   10            below    5
20   10            below   14
21   10      in front of    9
22   11  to the right of    1
23   11  to the right of    3
24   11  to the right of    5
25   12           behind   13
26   12           behind    7
27   13            above   11
28   14            above   15