What is the paper on?
The paper is on the glass.
    src        edge_attr  dst
0     0   to the left of   16
1     0               on    5
2     0   to the left of   11
3     0   to the left of    7
4     2   to the left of   17
..  ...              ...  ...
74   20   to the left of    9
75   22  to the right of    2
76   22   to the left of   10
77   23   to the left of   10
78   23  to the right of    2

[79 rows x 3 columns]