What color does the sky above the umbrella have?
The sky has gray color.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    3
2     2            above    3
3     2            above    8
4     3  to the right of   13
5     3  to the right of    0
6     4            under    8
7     4            below    8
8     4  to the right of    0
9     8            above    4
10   13   to the left of    3