What do both the frame and the sky have in common?
The color, both the frame and the sky are white.
     src        edge_attr  dst
0      0               on   28
1      0               on   31
2      0     hanging from   28
3      0   to the left of   29
4      1   to the left of   11
..   ...              ...  ...
165   31   to the left of    3
166   31   to the left of   26
167   31   to the left of    9
168   32  to the right of   31
169   32   to the left of   29

[170 rows x 3 columns]