Which side of the photo are the books on?
The books are on the left of the image.
    src        edge_attr  dst
0     0   to the left of   20
1     1  to the right of   14
2     2  to the right of   11
3     2  to the right of   10
4     2  to the right of   14
..  ...              ...  ...
65   19   to the left of    6
66   19  to the right of   18
67   20  to the right of   16
68   20  to the right of    0
69   20   to the left of   13

[70 rows x 3 columns]