Is the fence different in color than the pipe?
No, both the fence and the pipe are white.
    src        edge_attr  dst
0     0           behind    5
1     0  to the right of    5
2     0  to the right of    2
3     0  to the right of   10
4     1            under    5
5     1            below    5
6     2   to the left of    0
7     3  to the right of    9
8     3        on top of    5
9     4  to the right of    5
10    5      in front of    0
11    5            above    1
12    5   to the left of    4
13    5   to the left of    7
14    5               on    1
15    5   to the left of    0
16    6               on    5
17    7  to the right of    5
18    8               of    5
19    9   to the left of    3
20   10   to the left of    0