What kind of device is to the left of the man near the box?
The devices are controllers.
     src        edge_attr  dst
0      0   to the left of    9
1      0   to the left of    8
2      0  to the right of   23
3      0  to the right of   26
4      1   to the left of   25
..   ...              ...  ...
143   26   to the left of    1
144   26   to the left of   27
145   27   to the left of    6
146   27   to the left of   25
147   27  to the right of   26

[148 rows x 3 columns]