What is in front of the building?
The tree is in front of the building.
    src        edge_attr  dst
0     1   to the left of    5
1     1   to the left of    4
2     1   to the left of   21
3     1  to the right of    7
4     2   to the left of   17
..  ...              ...  ...
58   22   to the left of   11
59   22   to the left of   10
60   22   to the left of   17
61   22   to the left of    7
62   23   to the left of    7

[63 rows x 3 columns]