Do the sky and the fence have a different colors?
No, both the sky and the fence are blue.
     src       edge_attr  dst
0      0  to the left of   23
1      0  to the left of    5
2      0  to the left of    8
3      0  to the left of    7
4      1          behind   17
..   ...             ...  ...
234   34      leaning on   17
235   34  to the left of    3
236   34  to the left of   26
237   34  to the left of    4
238   34  to the left of   15

[239 rows x 3 columns]