What is on the shelf in the top part of the image?
The clock is on the shelf.
    src        edge_attr  dst
0     1  to the right of   18
1     1  to the right of   12
2     2  to the right of    8
3     3  to the right of    8
4     4  to the right of   18
..  ...              ...  ...
61   20  to the right of    8
62   21               on    9
63   22   to the left of   11
64   22   to the left of   19
65   22   to the left of   18

[66 rows x 3 columns]