What are the devices to the left of the guy that is to the left of the speaker?
The devices are controllers.
    src        edge_attr  dst
0     0   to the left of    4
1     0  to the right of    3
2     0   to the left of    9
3     1          wearing   14
4     1          wearing   18
..  ...              ...  ...
72   14   to the left of   13
73   15   to the left of    8
74   17   to the left of    8
75   18               on   17
76   18   to the left of    8

[77 rows x 3 columns]