On which side of the image is the tower?
The tower is on the left of the image.
    src        edge_attr  dst
0     0  to the right of   14
1     0   to the left of    7
2     1   to the left of    6
3     2  to the right of    6
4     2               on   15
5     3  to the right of    7
6     3  to the right of    5
7     5   to the left of    3
8     5  to the right of    7
9     6   to the left of    2
10    6  to the right of    1
11    6  to the right of   11
12    6   to the left of    8
13    7  to the right of    0
14    7   to the left of    3
15    7   to the left of    5
16    8  to the right of    6
17   10   to the left of   13
18   11   to the left of    6
19   13  to the right of   10
20   14   to the left of    0