What's the gate in front of?
The gate is in front of the cans.
     src        edge_attr  dst
0      0           behind    3
1      0    surrounded by    3
2      0   to the left of   24
3      0  to the right of   13
4      0   to the left of    2
..   ...              ...  ...
174   28  to the right of   16
175   28   to the left of   15
176   28  to the right of   14
177   28   to the left of   20
178   28   to the left of   19

[179 rows x 3 columns]