Are the tray and the bowl made of the same material?
No, the tray is made of wood and the bowl is made of metal.
     src        edge_attr  dst
0      0   to the left of   22
1      0  to the right of   17
2      0   to the left of   25
3      0  to the right of    2
4      0  to the right of    1
..   ...              ...  ...
176   26   to the left of   22
177   26   to the left of   25
178   26           eating   28
179   27  to the right of   18
180   28   to the left of    1

[181 rows x 3 columns]