What is on the seat that looks black and blue?
The tray is on the seat.
     src        edge_attr  dst
0      0  to the right of   16
1      0   to the left of   10
2      0   to the left of    7
3      0   to the left of   15
4      1               on   13
..   ...              ...  ...
146   19  to the right of   13
147   19  to the right of    4
148   19  to the right of   18
149   20  to the right of   13
150   20   to the left of    7

[151 rows x 3 columns]