Does the balcony look gray?
Yes, the balcony is gray.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    3
2     3  to the right of    0
3     4   to the left of   13
4     5   to the left of   13
5     5   to the left of    8
6     6               on   13
7     6               on    7
8     8  to the right of   10
9     8  to the right of    5
10    9  to the right of   12
11   10   to the left of    8
12   10               on   12
13   10   to the left of   13
14   12  to the right of    0
15   12   to the left of    9
16   13  to the right of   14
17   13  to the right of    4
18   13  to the right of    5
19   13  to the right of   10
20   14   to the left of   13