Does the high fence appear to be green or silver?
The fence is green.
   src         edge_attr  dst
0    1    to the left of    6
1    1   to the right of    2
2    2    to the left of    5
3    2    to the left of    1
4    3            behind    4
5    4       in front of    3
6    5  standing next to    1
7    5   to the right of    2
8    6   to the right of    1