Which side of the picture are the books on, the left or the right?
The books are on the left of the image.
    src        edge_attr  dst
0     0   to the left of    5
1     0       sitting on    3
2     0   to the left of    1
3     1   to the left of   12
4     1   to the left of   22
..  ...              ...  ...
69   21  to the right of    8
70   21  to the right of    2
71   22  to the right of   19
72   22  to the right of   18
73   22  to the right of    1

[74 rows x 3 columns]