What is common to the sign and the balcony?
The material, both the sign and the balcony are metallic.
    src        edge_attr  dst
0     0  to the right of   18
1     0               on    7
2     0     hanging from   14
3     0   to the left of   15
4     0   to the left of    4
..  ...              ...  ...
81   19   to the left of    1
82   20     hanging from   14
83   20               on    7
84   21     hanging from   14
85   21               on    7

[86 rows x 3 columns]